| Orthogonal polynomial solutions of linear ordinary differential equations WN Everitt, KH Kwon, LL Littlejohn, R Wellman Journal of computational and applied mathematics 133 (1-2), 85-109, 2001 | 98 | 2001 |
| Jacobi–Stirling numbers, Jacobi polynomials, and the left-definite analysis of the classical Jacobi differential expression WN Everitt, KH Kwon, LL Littlejohn, R Wellman, GJ Yoon Journal of Computational and Applied Mathematics 208 (1), 29-56, 2007 | 83 | 2007 |
| Legendre polynomials, Legendre–Stirling numbers, and the left-definite spectral analysis of the Legendre differential expression WN Everitt, LL Littlejohn, R Wellman Journal of computational and applied mathematics 148 (1), 213-238, 2002 | 77 | 2002 |
| A general left-definite theory for certain self-adjoint operators with applications to differential equations LL Littlejohn, R Wellman Journal of Differential Equations 181 (2), 280-339, 2002 | 49 | 2002 |
| The Sobolev orthogonality and spectral analysis of the Laguerre polynomials {Ln− k} for positive integers k WN Everitt, LL Littlejohn, R Wellman Journal of computational and applied mathematics 171 (1-2), 199-234, 2004 | 33 | 2004 |
| On Birman's sequence of Hardy–Rellich-type inequalities F Gesztesy, LL Littlejohn, I Michael, R Wellman Journal of Differential Equations 264 (4), 2761-2801, 2018 | 23 | 2018 |
| The left-definite spectral theory for the classical Hermite differential equation WN Everitt, LL Littlejohn, R Wellman Journal of computational and applied mathematics 121 (1-2), 313-330, 2000 | 22 | 2000 |
| Serendipity in interactive mathematics: Virtual (electronic) manipulatives for learning elementary mathematics L Cannon, R Heal, R Wellman Society for Information Technology & Teacher Education International …, 2000 | 19 | 2000 |
| On the Spectral Analysis of the Laguerre Polynomials Ln− k (x) for Positive Integers kLn˜− k (x) for Positive Integers k WN Everitt, KH Kwon, LL Littlejohn, R Wellman Spectral Theory & Computational Methods of Sturm-Liouville Problems, 251-283, 2021 | 12 | 2021 |
| Self-adjoint representations of a certain sequence of spectral differential equations R Wellman Utah State University, 1995 | 12 | 1995 |
| Left-definite theory with applications to orthogonal polynomials A Bruder, LL Littlejohn, D Tuncer, R Wellman Journal of computational and applied mathematics 233 (6), 1380-1398, 2010 | 10 | 2010 |
| The symmetric form of the Koekoeks' Laguerre type differential equation WN Everitt, LL Littlejohn, R Wellman Journal of computational and applied mathematics 57 (1-2), 115-121, 1995 | 10 | 1995 |
| On the spectra of left-definite operators LL Littlejohn, R Wellman Complex Analysis and Operator Theory 7, 437-455, 2013 | 9 | 2013 |
| Differential operator for discrete Gegenbauer–Sobolev orthogonal polynomials: eigenvalues and asymptotics LL Littlejohn, JF Mañas-Mañas, JJ Moreno-Balcázar, R Wellman Journal of Approximation Theory 230, 32-49, 2018 | 8 | 2018 |
| Self-Adjoint Operators in Extended Hilbert Spaces : An Application of the General GKN-EM Theorem L Littlejohn, R Wellman arXiv preprint arXiv:1704.06950, 2017 | 6 | 2017 |
| National library of virtual manipulatives for interactive mathematics L Cannon, J Dorward, B Heal, L Edwards, R Wellman MATTI Associates LLC. Retrieved April 8, 2002, 2001 | 6 | 2001 |
| Left-definite spectral theory with applications to differential operators LL Littlejohn, R Wellman J. Diff. Equations, 0 | 5 | |
| Eigenvalue problem for discrete Jacobi–Sobolev orthogonal polynomials JF Mañas-Mañas, JJ Moreno-Balcázar, R Wellman Mathematics 8 (2), 182, 2020 | 4 | 2020 |
| Spectral analysis of the sixth-order Krall differential expression K Elliott, LL Littlejohn, R Wellman Advances in Operator Theory 5 (3), 1078-1099, 2020 | 2 | 2020 |
| On the completeness of orthogonal polynomials in left-definite Sobolev spaces WN Everiit, LL Littlejohn, R Wellman Topics In Polynomials Of One And Several Variables And Their Applications …, 1993 | 1 | 1993 |
