Due to various copyright restrictions, only the PDF files marked "public" are freely accessible.

**2013
**

**
PDF
(with X. Yao and J. Sun)
Self-Adjoint Domains, Symplectic Geometry and Limit-Circle Solutions
J. Math. Anal. Appl. 397 (2013) 644657.
PDF
(with M. Zhang and J. Sun)
The Spectrum of Singular Sturm-Liouville Problems with Eigendependent Boundary Conditions and its
Approximation
Results Math. 63 (2013) 1311-1330.
PDF
(with A. Wang)
The Green's Function of Two-Interval Sturm-Liouville Problems
Electronic Journal of Differential Equations 76 2013 (2013) 1-13.
PDF
(with J. Ao and J. Sun)
Equivalence of Fourth Order Boundary Value Problems and Matrix Eigenvalue Problems
Results in Mathematics 63 (2013), 581-595.
PDF
(with X. Yao and J. Sun)
The Sturm-Liouville Friedrichs Extension
pre-print.
PDF
(with M. Zhang and J. Sun)
Eigenvalues of Limit-Point Sturm-Liouville Problems
pre-print.
PDF
(with S. Yao and J. Sun)
Symplectic Geometry and Dissipative Differential Operators
pre-print.
**

**
2012
**

**
PDF
(with X. Hao, J. Sun and A. Wang)
Characterization of Domains of Self-Adjoint Ordinary Differential Operators II
Results in Mathematics 61 (2012), 255-281.
PDF
(with X. Hao and J. Sun)
The Spectrum of Differential Operators and Square-Integrable Solutions
J. Functional Analysis 262 (2012) 1630-1644.
PDF
(with A. Wang, J. Ridenhour)
Construction of Regular and Singular Green's Functions
Proc. Roy. Soc. Edinburgh, 142A, (2012), 171-198.
PDF
(with Q. Kong)
Inverse Sturm-Liouville Problems with Finite Spectrum
J. Math. Anal. Appl. 386, (2012), 1-9.
PDF
(with J. Ao and J. Sun)
Matrix Representations of Fourth Order Boundary Value Problems with Finite Spectrum Linear Algebra and its Applications 436 (2012), 2359-2365.
PDF
(with X. Hao and J. Sun)
Canonical Forms of Self-Adjoint Boundary Conditions for Differential operators of Order Four J. Math. Anal. Appl. 387 (2012) 1176-1187.
PDF
(with X. Hao and J. Sun)
Fourth Order Canonical Forms of Singular Self-Adjoint Boundary Conditions
Linear Algebra and its Applications 437 (2012), 899-916.
**

**
2011
**

**
PDF
(with Q. Kong)
The Study of Jacobi and Cyclic Jacobi Matrix Eigenvalue Problems Using
Sturm-Liouville Theory
Linear Algebra and its Appl. 434 (2011), 1648-1655.
PDF
(with X. Hao and J. Sun)
Real-Parameter Square-Integrable Solutions and the Spectrum of Differential Operators
J. Math. Anal. Appl. 376 (2011), 696-712.
PDF
(with A. Wang, and J. Sun)
The Classification of Self-Adjoint Boundary Conditions of Singular
Differential Operators with two Singular Endpoints
J. Math. Anal. Appl. 378 (2011), 493-506.
PDF
(with L. L. Littlejohn)
The Legendre Equation and its Self-Adjoint Operators
Electronic J. Differential Equations (2011), 1-33.
PDF
(with M.K. Kwong)
New Proofs and Extensions of Sylvester's and Johnson's Inertia Theorems to Non-Hermitian Matrices
Proc. Amer. Math. Soc. 139 3795-3806.
**

**
2009
**

**
PDF
(with A. Wang, and J. Sun)
Characterization of Domains of Self-Adjoint Ordinary Differential Operators
J. Differential Equations 246 (2009), 1600-1622.
PDF
(with Q. Kong and H. Volkmer)
Matrix Representations of Sturm-Liouville Problems with Finite Spectrum
near Algebra and its Applications 434 (2009), 1648-1655.
PDF
(with A. Wang and J. Sun)
An Interesting Matrix Equation
Miskolc Mathematical Notes v.10 (2009), 107-113.
**

**
2008
**

**
PDF
(with Q. Kong and H. Wu)
Limits of Sturm-Liouville Eigenvalues When the Interval Shrinks to an Endpoint
Proc. Roy. Soc. Edinburgh, 138A, (2008), 323-338.
PDF
Discovering Properties of Numbers and Functions: Rigor with Vigor
J. of Inquiry Based Learning in Mathematics, JIBLM), (2008).
PDF
(with J. Sun and A. Wang)
The Classification of Self-Adjoint Boundary Conditions: Separated, Coupled and Mixed
Journal of Functional Analysis 255 (2008) 1554-1573.
PDF
(with J. Sun and A. Wang)
Continuous Spectrum and Square-Integrable Solutions of Differential Operators With Intermediate
Deficiency Index
Journal of Functional Analysis 255 (2008) 3229-3248.
**

**
2007
**

**
PDF
(with X. Cao, Q. Kong and H. Wu)
Geometric Aspects of Sturm-Liouville Problems III. Level Surfaces of the n-th Eigenvalue
J. Computational and Applied Mathematics 208, (2007), 178-193.
PDF
(with A. Wang, and J. Sun)
Two-Interval Sturm-Liouville Operators In Modified Hilbert Spaces
J. Math. Anal. and Appl. 328, (2007), 390-399.
PDF
(with J. Sun and A. Wang)
Two-Interval Sturm-Liouville Operators In Direct Sum Spaces With Inner Product Multiples
Results in Mathematics, (2007), 155-168.
PDF
(with H. Volkmer)
Inverse Spectral Theory For Sturm-Liouville Problems With Finite Spectrum
Proc. Amer. Math. Soc. (2007), 1129-1132.
PDF
(with Lance L. Littlejohn)
Left-Definite Variations of the Classical Fourier Expansion Theorem
Electronic Transactions of Numerical Analysis 27 (2007), 1129-1132.
**

**
2005
**

**
PDF
(with M. Marletta)
Floquet Theory for Left-Definite Sturm-Liouville Problems
J. Math. Analysis and Appl. 305, (2005), 477-482.
PDF
Dachau/Buchenwald/Gakowa: Reminiscences of a World War II Survivor
J. Political and Military Sociology, 33 (2005), 267-276.
PDF
(with W. Eberhard and G. Freiling)
Sturm-Liouville Problems with Singular Non-Self-Adjoint Boundary Conditions
Math. Nachrichten, 278, (2005), 1509-1523.
**

**
2004
**

**
PDF
(with Q. Kong and H. Wu)
Singular Left-Definite Sturm-Liouville Problems
Left-Definite Sturm-Liouville Problems''
J. Differential equations, 206 (2004), 1-29.
PDF
(with L. Kong, Q. Kong and H. Wu)
Regular Approximations of Singular Sturm-Liouville Problems
Results in Mathematics, 45, (2004), 274-292.
PDF
(with Q. Kong and H. Wu)
Multiplicity of Sturm-Liouville Eigenvalues
JCAM, J. Computational and Applied Math, 171, (2004), 291-309.
PDF
(with M. Marletta)
Spectral Inclusion and Spectral Exactness of Left-Definite Sturm-Liouville Problems
Results in Mathematics, (2004), 299-308.
**

**
2003
**

**
PDF
(with M. K. Kwong)
An alternate proof of Kato's Inequality
Evolution Equations: Proceedings in honor of J. A. Goldstein's 60th Birthday,
Marcel Dekker, New York, 2003.
PDF
(with P.B. Bailey, J. Billingham, R.J. Cooper, W.N. Everitt, A.C. King, Q. Kong and H. Wu)
On some eigenvalue problems in fuel cell dynamics
Proc. Roy. Soc. London A (2003) 459, 241-261.
PDF
(with Q. Kong, M. Moeller, and H. Wu)
Indefinite Sturm-Liouville Problems
Proc. Roy. Soc. Edinburgh, 133A, (2003), 639-652.
PDF
(with P.B. Bailey, W.N. Everitt, D.B. Hinton)
Some spectral properties of the Heun Differential Equation
Proc. of Sovalevsky Symposium, (to appear).
PDF [public]
(with K. Haertzen, Q. Kong and H. Wu)
Geometric Aspects of Sturm-Liouville Problems II. Subspace of boundary conditions for
left-definiteness
Trans. Amer. Math. Soc. 356, (2003), 135-157.
PDF
(with W. N. Everitt)
The Kallman-Rota Inequality; a Survey
Gian-Carlo Rota on Analysis and Probability; Selected papers and Commentaries, Chapter 5; Pages
227-250. Birkhauser, Boston, 2003.
PDF
(with X. Cao, Q. Kong and H. Wu)
Sturm-Liouville Problems Whose Leading Coefficient Function Changes Sign
Canadian J. Math. v. 55 (4), 2003, 724-749.
**

**
2002
**

**
PDF
(with M. Marletta)
Counting and computing eigenvalues of left-definite Sturm-Liouville problems
J. Computational and Applied Mathematics, 148 (2002), 65-75.
**

**
2001
**

**
PDF
(with W.N. Everitt and M. Marletta)
Inequalities and eigenvalues of Sturm-Liouville problems near a singular boundary
J. Inequalities and Applications, 6, (2001), 405-413.
(2001), 405-413.
PDF
(with Q. Kong and H. Wu)
Left-Definite Sturm-Liouville Problems
J. Differential Equations, Equations 177, (2001), 1-26.
PDF
(with Q. Kong)
The derivative of the matrix exponential function
Cubo Matematica Educacional, v.3, (2001), 121-124.
121-124.
PDF
(with P.B. Bailey and W.N. Everitt)
THE SLEIGN2 STURM-LIOUVILLE CODE
ACM TOMS, ACM Trans. Math. Software 21 (2001), 143-192.
PDF
(with Q. Kong and H. Wu)
Sturm-Liouville Problems with finite spectrum
J. Math. Anal. and Appl. (2001), 1-15.
**

**
2000
**

**
PDF
(with M. Marletta)
The Friedrichs extension of singular differential operators
J. Differential Equations 160, (2000), 404-421.
PDF
(with Q. Kong and H. Wu)
Geometric Aspects of Sturm-Liouville problems, I. Structures on spaces of boundary conditions
Proc. Roy. Soc. Edinburgh, 130A, 561-589, (2000).
PDF
(with Q. Kong, Q. Lin, and H. Wu)
A new proof of the inequalities among Sturm-Liouville eigenvalues
PanAmerican Math. J. 10, (2000), No. 2, 1-11.
PDF
(with B.M. Brown and D.K.R. McCormack)
On a computer assisted proof of eigenvalues below the essential spectrum of the Sturm-Liouville
problem
J. Computational and Applied Math., 125 (2000), 385-393.
**

**
1999
**

**
PDF
(with E. S. P. Eastham, Q. Kong and H. Wu)
Inequalities among eigenvalue of Sturm-Liouville problems
J. Inequalities and Applications, 3, (1999), 25-43.
PDF
(with W.N. Everitt and M. Möller)
Sturm-Liouville problems and discontinuous eigenvalues
Proc. Roy. Soc. Edinburgh, 129A, 1999, 707-716.
129A, 1999, 707-716
PDF
(with B. M. Brown and D.K.R. McCormack)
On The existence of an eigenvalue below the essential spectrum
Proc. R. Soc. London, A (1999), 455, 2229-2234.
PDF
(with Q. Kong and H. Wu)
Dependence of the n-th Sturm-Liouville eigenvalue on the problem
J. Differential Equations 156, (1999), 328-354.
PDF
(with Q. Kong and H. Wu)
Inequalities among eigenvalues of singular Sturm-Liouville problems
Special Issue on `Continuous and Discrete Hamiltonian Systems', Dynamical Systems and Applications, 8
(1999), 517-531.
**

**
1998
**

**
PDF
On the Friedrichs extension of singular differential operators
Communications in Applied Analysis 2 (1998), no.1, 31-36.
PDF
(with A. M. Krall)
Singular self-adjoint Sturm-Liouville problesm
Differential and Integral Equations 4 (1998), 423-432.
**

**
1997
**

**
PDF
(with W.N. Everitt and M. Möller)
Discontinuous dependence of the n-th Sturm-Liouville eigenvalue
Birkhäuser, General Inequalities 7, v. 123, (1997), 145-150. Proceedings of 7-th International
Conference at Oberwolfach, Nov. 13-19, 1995.
PDF
Sturm-Liouville Problems
spectral theory and computational methods of Sturm-Liouville problems, Marcel Dekker, v. 191, (1997),
1-104. Proceedings of the 1996 Knoxville Barrett Conference, edited by D. Hinton and P. Schaefer.
PDF
(with Q. Kong and H. Wu)
Dependence of eigenvalues on the problem
Mathematische Nachrichten, 188, (1997), 173-201.
PDF
(with W.N. Everitt, C. Shubin, G. Stolz)
Sturm-Liouville problems with an infinite number of interior singularities
spectral theory and computational methods of Sturm-Liouville problems, Marcel Dekker, v. 191, (1997),
211-249. Proceedings of the 1996 Knoxville Barrett Conference, edited by D. Hinton and P. Schaefer.
PDF
(with Q. Kong and H. Wu)
Dependence of Eigenvalues on the Problem
Mathematische Nachrichten, 188, (1997), 173-201.
**

**
1996
**

**
PDF
(with P.B. Bailey and W.N. Everitt)
Regular and singular Sturm-Liouville problems with coupled boundary conditions
Proc. Roy. Soc. Edinburgh, 126A, (1996), 505-514.
PDF
(with Q. Kong)
Dependence of eigenvalues of Sturm-Liouville problems on the boundary
J. Differential Equations, v. 126, No 2, (1996), 389-407.
PDF
(with Q. Kong)
Eigenvalues of regular Sturm-Liouville problems
J. Differential Equations, v. 131, no.1, (1996), 1-19.
PDF
(with M. Möller)
Differentiable dependence of eigenvalues of operators in Banach spaces
J. Operator Theory, 36 (1996), 335-355.
**

**
1995
**

**
PDF
(with M. M\"oler)
Semi-boundedness of ordinary differential operators
J. Differential Equations, v.115, n.1, 1995, 24-49.
1995, 24-49.
PDF
(with M. Möller)
Symmetric differential operators and their Friedrich's extension
J. Differential Equations, v.115, n.1, 1995, 50-69.
PDF
(with H.I. Dwyer)
Eigenvalue computations for regular matrix Sturm-Liouville problems
Electronic J. Diff. Equ., EJDE. (1995).
PDF
(with Q. Kong)
Interval oscillation conditions for difference equations
SIAM J. Math. Analysis, 26, No.4,(1995), 1047-1060.
**

**
1994
**

**
PDF
Computing Continuous Spectrum
Trends and Developements in Ordinary Differential Equations, edited by Y. Alavi and P.-F. Hsieh,
World Scientific, (1994), 393-406.
PDF
(with Q. Kong)
Linear ordinary differential equations
Inequalities and Applications dedicated to Wolfgang Walter. WSSIAA 3 (1994), 381-397.
PDF
(with H.I. Dwyer)
Computing eigenvalues of regular Sturm-Liouville problems
Electronic J. Diff. Equ., (EJDE), WSSIAA 3 (1994), 381-397. (http://ejde.math.swt.edu)
**

**
1993
**

**
PDF
(with P. B. Bailey, W. N. Everitt and J. Weidmann)
Regular approximations of singular Sturm-Liouville problems
Results in Mathematics,v.22,(1993), 3-22.
PDF
(with M. Möller)
Weighted norm inequalities for the quasi-derivatives of ordinary differential operators
Results in Mathematics 24 (1993), 153-160.
PDF
(with D. Race)
Nullspaces, representations and factorizations of quasi-differential expressions
Differential and Integral Equations 6 (1993), 949-960.
PDF
(with Frentzen and Race)
On the commutativity of certain quasi-differential expressions II
Proc. Roy. Soc. Edinburgh. 123A, (1993), 27-43.
**

**
1992
**

**
PDF
(with W.N. Everitt)
Differential operators generated by a countable number of quasi-differential expressions on the
line
Proc. London Math. Soc.(3), 64, (1992), 524-544.
PDF
(with H.D. Niessen)
Singular Sturm-Liouville problems: The Friedrichs extension and comparison of eigenvalues
Proc. London Math. Soc. 3 v.64 (1992), 545-578.
PDF
(with D. Race)
Characterization of the factors of quasi-differential expressions
Proc. Roy. Soc. Edinburgh 120A, (1992), 297-312.
**

**
1991
**

**
PDF
(with M.K. Kwong)
Norm inequalities for derivatives and differences
Inequalities, Marcel Dekker, 91-123.
PDF
(with M.K. Kwong)
Norm inequalities for the powers of a matrix
American Math. Monthly, v.98, no.6 (1991), 533-538.
PDF
(with P.B. Bailey and W.N. Everitt)
Computing eigenvalues of singular Sturm-Liouville problems
Results in Mathematics v.20 (1991),391-423.
PDF
(with P.B. Bailey, B.S. Garbow and H.G. Kaper)
Eigenvalue and eigenfunction computations for Sturm-Liouville problems
ACM TOMS v.17(1991),491-499.
PDF
(with P.B. Bailey, B.S. Garbow and H.G. Kaper)
Algorithm 700, A FORTRAN software package for Sturm-Liouville problems
ACM TOMS v.17 (1991),500-501.
**

**
1990
**

**
PDF
(with H.D. Niessen)
The Friedrichs extension of regular ordinary differential operators
Proc. Roy. Soc. Edinburgh, 11 4A(1990), 229-236.
PDF
(with D.Race)
On the commutativity of certain quasi-differential expressions
J. London Math. Society, v.42 (1990), 489-504.
**

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1989
**

**
PDF
(with M.K. Kwong)
Best constants for discrete Kolmogorov inequalities
Houston J. Math., (1989), 99-119.
**

**
1988
**

**
PDF
(with F. V. Atkinson and W. N. Everitt)
Regularization of a Sturm-Liouville problem with an interior singularity using
quasi-derivatives
Differential and Integral Equations, v. 1(1988), 213-221.
PDF
(with A. M. Krall)
Singular Sturm-Liouville problems II. , Interior singular points
SIAM J. Math. Anal, (1988), 1135-1141.
PDF
(with M. K. Kwong)
Landau's inequality for the difference operator
Proc. Amer. Math. Soc., v. 104 (1988), 201-206.
PDF
(with A. M. Krall)
Singular self-adjoint Sturm-Liouville problems
Differential and Integral Equations, v. 1(1988), 423-432.
**

**
1987
**

**
PDF
(with M. K. Kwong)
Extremals in Landau's inequality for the difference operator
Proc. Roy. Soc. Edinburgh, v. 107(1987), 299-311.
PDF
(with W. N. Everitt and J. Gunson)
Some comments on Sturm-Liouville eigenvalue problems with interior singularities
Zeitschrift fuer Angewandte Mathematik und Physik, v. 38 (1987), 813-838.
**

**
1986
**

**
PDF
(with W. N. Everitt)
Sturm-Liouville differential operators in direct sum spaces
Rocky Mountain J. of Mathematics, (1986), 497-516.
(1986), 497-516.
PDF
(with H. G. Kaper and M. K. Kwong)
Characterization of the Friedrichs extensions of singular Sturm-Liouville expressions
SIAM J. Math. Anal., 7(1986), 772-777.
**

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1985
**

**
PDF
(with Z. M. Franco, H. G. Kaper and M. K. Kwong)
Best constants in norm inequalities for derivatives on a half-line
Proc. Roy. Soc. Edinburgh, 100A(1985), 67-84.
PDF
The essential spectrum of nonselfadjoint ordinary differential operators
Proceedings of the twelfth and thirteenth Midwest Ordinary Differential Equations Conference,
University of Missouri at Rolla Press; edited by J. L. Henderson (1985), 152-168.
**

**
1984
**

**
PDF
(with W. N. Everitt and M. K. Kwong)
Differential operators and quadratic inequalities with a degenerate weight
J. Math. Anal. and Appl., 98(1984), 378-399.
PDF
(with H. G. Kaper and M. K. Kwong)
Regularizing transformations for certain singular Sturm-Liouville boundary value problems
SIAM J. Math. Anal., V. 15(1984), 957-963.
PDF
(with H. G. Kaper, M. K. Kwong and C. G. Lekkerkerker)
Full and partial-range eigenfunction expansions for Sturm-Liouville problems with indefinite
weights
Proc. Roy. Soc. Edinburgh, 98A (1984), 69-88.
PDF
(with H. G. Kaper and M. K. Kwong)
Singular Sturm-Liouville problems with nonnegative and indefinite weights
Monatsheft fuer Mathematik, 97(1984), 177-189.
PDF
(with M. K. Kwong)
Landau's inequality
Proc. Roy. Soc. Edinburgh, 97A(1984), 161-163.
**

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1983
**

**
PDF
(with W. N. Everitt and M. K. Kwong)
Oscillation of eigenfunctions of weighted regular Sturm-Liouville problems
J. London Math. Soc., 27(1983), 106-120.
PDF
(with W. D. Evans and M. K. Kwong)
Lower bounds for the spectrum of ordinary differential operators
J. of Differential Equations., 48(1983), 123-155.
PDF
(with M. K. Kwong)
Asymptotically constant functions and second order linear oscillation
J. of Math. Anal. and Applications, 93(1983), 475-494.
PDF
(with J. Goldstein and M. K. Kwong)
Weighted Landau inequalities
J. Math. Anal. and Appl., 95(1983), 20-28.
PDF
(with Z. Franco, H. G. Kaper, M. K. Kwong)
Bounds for the best constants in Landau's inequality on the line
Proc. Roy. Soc. Edinburgh, 95A(1983), 257-262.
**

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1982
**

**
PDF
(with M. K. Kwong)
Integral inequalities, and second order linear oscillation
J. Diff. Equations, 45(1982), 16-33.
**

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1981
**

**
PDF
(with M. Giertz and M. K. Kwong)
Commuting linear differential expressions
Proc. Roy. Soc. Edinburgh, 87A(1981), 331-347.
PDF
(with M. K. Kwong)
Weighted norm inequalities of the sum form involving derivatives
Proc. Roy. Soc. Edinburgh, 88A (1981), 121-134.
PDF
(with M. K. Kwong)
Norm inequalities of product form is weighted $L^p $ spaces
Proc. Roy. Soc. Edinburgh, 89A(1981), 293-307.
89A(1981), 293-307.
PDF
(with M. K. Kwong)
Discreteness conditions for the spectrum of ordinary differential operators
J. Differential Equations, V. 40(1981), 53-70.
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1980
**

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PDF
(with M. K. Kwong)
Ramifications of Landau's Inequality
Proc. Roy. Soc. Edinburgh, 86A(1980), 175-212.
**

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1979
**

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PDF
(with M. K. Kwong)
Norm inequalities for dissipative operators on inner product spaces
Houston J. Math. V. 5(1979), 543-557.
PDF
(with M. K. Kwong)
An extension of the Hardy-Littlewood inequality
Proc. Amer. Math. Soc., 77(1979), 117-118.
PDF
(with W. N. Everitt)
Generalized symmetric ordinary differential expressions, I. The basic theory
Nieuw Archief. voor Wiskunde, (3), XXVII (1979), 363-397.
PDF
(with M. K. Kwong)
Remarks on best constants for norm inequalities among powers of an operator
J. Approx. Theory, 26(1979), 248-258.
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1978
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PDF
(with W. D. Evans)
Dirichlet and separation results for Schrodinger type operators
Proc. Roy. Soc. Edinbrugh, 80A (1978), 151-162.
PDF
(with W. D. Evans)
Norm inequalities involving derivativs
Proc. Roy. Soc. Edinburgh, A. (1978), 51-70.
PDF
(with W. N. Everitt)
On a class of integral inequalities
J. London Math. Soc., 17(1978), 291-303.
PDF
(with W. N. Everitt)
Products of differential expressions without smoothness assumptions
Quaestiones Mathematicae, 3(1978), 67-82.
PDF
(with W. D. Evans)
Levinson's limit-point criterion and powers
J. Functional Analysis and Applications, V. 62 (1978), 629-639.
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1977
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PDF
(with W. N. Everitt)
The number of integrable-square solutions of products of differential expressions
Proc. Roy. Soc. Edinburgh, 76A, (1977), 215-226.
PDF
(with M. S. P. Eastham)
Second order differential expressions whose squares are limit-3
Proc. Roy. Soc. Edinburgh, 16(1977), 223-238.
PDF
(with W. D. Evans)
Interval limit-point criterial for differential expressions and their powers
J. London Math. Soc., 15 (1977), 119-133.
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1976
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PDF
Perturbation theory of deficiency indices of differential operators
J. London Math. Soc., (2), 12(1976).
PDF
Separation for differential expressions and the $L^p $ spaces
Proc. Amer. Math. Soc., V. 55, 1, 1976.
PDF
An algorithm for the construction of limit circle expressions
Proc. Royal Soc. Edinbrugh, 75A, 1, 1976.
PDF
An algorithm for the construction of all disconjugate operators
Proc. Royal Society of Edinburgh, 75A, 4, 1976.
PDF
(with W. D. Evans)
On the deficiency indices of powers of real $2n$th order symmetric differential expressions
J. London Math. Soc. (2), 13(1976), 543-556.
PDF
Powers of symmetric differential expressions without smoothness assumptions
Quaestiones Mathematicae, 1(1976), 83-94.
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1975
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PDF
Formally self-adjoint quasi-differential operators
Rocky Mountain Journal of Math., V. 5 (1975), 453-474.
PDF
The limit point and limit circle cases for polynomials in a differential operator
Proc. Royal Society of Edinburgh, (1975), 219-224.
PDF
A constructive characterization of disconjugacy
Bull. Amer. Math. Soc., Vol 81, No. 1 (1975).
PDF
Perturbation of the limit circle case
Quart. J. Math. Oxford, (1975).
PDF
Deficiency indices of polynomials in symmetric differential expressions II
Proc. Royal Soc. Edinburgh, 73A, 20(1974/75).
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1974
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PDF
General theory of the factorization of nth order linear differential operators
Transactions American Math. Soc., V. 197 (1974), 341-353.
PDF
A characterization of the factors of ordinary linear differential operators
Bulletin Amer. Math. Soc., V. 80, No. 3 (1974), 498-500.
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1973
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PDF
Explicit conditions for the factorization of nth order linear differential operators
Proc. Amer. Math. Soc., 41, No. 1, (1973), 137-145.
PDF
(with J. S. W. Wong)
On the limit point classification of second order differential equations
Mathematische Zeitschrift, (1973), 297-304.
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1972
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PDF
Factorization and disconjugacy of third order differential equations
Proc. Amer. Math. Soc., 31(1972), 203-208.
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1971
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PDF
Factorization of differential operators
Proc. Amer. Math. Soc., 27(1970), 425-426.
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1970
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PDF
Square integrable solutions of $Ly = f(t,y)$
Proc. Amer. Math. Soc., (1970), 635-639.
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1969
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PDF
A note on square integrable solutions of linear differential equations
Proc. Amer. Math. Soc., 21(1969), 671-672.
PDF
Adjointness in non-adjoint boundary value problems
SIAM J. Appl. Math., 17(1969), 1268-1279.
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1968
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PDF
Adjoint and self-adjoint boundary value problems with interface conditions
SIAM J. Appl. Math., 16(1968), 851-859.
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1967
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PDF
Some identities related to Polya's property $W$ for linear differential equations
Proc. Amer. Math. Soc., 18(1967), 992-994.
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1966
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PDF [public]
(with E. A. Coddington)
Hermitian and anti-Hermitian properties of Green's matrices
Pac. J. Math., 18(1966), 451-454.
PDF [public]
The lack of self-adjointness in three point boundary value problems
Proc. Amer. Math. Soc., 17(1966), 368-371.
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1965
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PDF [public]
Adjoint linear differential operators
Proc. Amer. Math. Soc., 16(1965), 1239-1241.
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