The Different Ways of Stabbing Disjoint Convex Sets. M. Katchalski; T. Lewis; A. Liu — 1992 Discrete & computational geometry
Geometric Permutations and Common Transversals. M. Katchalski; T. Lewis; A. Liu — 1986 Discrete & computational geometry
On the existence of a class of stationary quantum stochastic processes J. T. Lewis; L. C. Thomas — 1975 Annales de l'I.H.P. Physique théorique
A Hille-Wintner comparison theorem for second order differential systems Garret J. Etgen; Roger T. Lewis — 1980 Czechoslovak Mathematical Journal
The essential spectrum of relativistic multi-particle operators Roger T. Lewis; Heinz Siedentop; Simeon Vugalter — 1997 Annales de l'I.H.P. Physique théorique
A minimax principle for eigenvalues in spectral gaps: Dirac operators with Coulomb potentials. Griesemer, Marcel; Lewis, Roger T.; Siedentop, Heinz — 1999 Documenta Mathematica