Anton Zettl's Publications

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

2014

PDF (with M. Zhang and J. Sun) Eigenvalues of Limit-Point Sturm-Liouville Problems J. Math. Anal Appl. 419 (2014), 627-642. PDF Eigenvalues of Regular Self-Adjoint Sturm-Liouville Problems Communications in Applied Analysis 18 (2014), 365-400.
PDF (with M. Zhang and J. Sun) Eigenvalues of Limit-Point Sturm-Liouville Problems J. Math. Anal Appl. 419 (2014), 627-642.
PDF (with X. Yao and J. Sun) Self-Adjoint Domains, Symplectic Geometry and Dissipative Differential Operators J. Math. Anal. Appl. 419 (2014), 218-230.
PDF (with X. Yao and J. Sun) The Sturm-Liouville Friedrichs Extension Applications of Mathematics (to appear).
PDF (with A. Wang) Self-Adjoint Sturm-Liouville Problems with Discontinuous Boundary Conditions Methods of Applied Analysis (to appear).

2013

PDF (with X. Yao and J. Sun) Self-Adjoint Domains, Symplectic Geometry, and Limit-Circle Solutions J. Math. Anal. Appl. 397 (2013), 644-657.
PDF (with M. Zhang and J. Sun) The Spectrum of Singular Sturm-Liouville Problems with Eigendependent Boundary Conditions Results in 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.

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.

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.

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.

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.

1982

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

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.

1980

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

1979

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.

1978

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.

1977

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.

1976

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.

1975

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).

1974

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.

1973

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.

1972

PDF Factorization and disconjugacy of third order differential equations Proc. Amer. Math. Soc., 31(1972), 203-208.

1971

PDF Factorization of differential operators Proc. Amer. Math. Soc., 27(1970), 425-426.

1970

PDF Square integrable solutions of $Ly = f(t,y)$ Proc. Amer. Math. Soc., (1970), 635-639.

1969

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.

1968

PDF Adjoint and self-adjoint boundary value problems with interface conditions SIAM J. Appl. Math., 16(1968), 851-859.

1967

PDF Some identities related to Polya's property $W$ for linear differential equations Proc. Amer. Math. Soc., 18(1967), 992-994.

1966

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.

1965

PDF [public] Adjoint linear differential operators Proc. Amer. Math. Soc., 16(1965), 1239-1241.