Stability of fixed points for order-preserving discrete-time dynamical systems. E.N. Dancer; P. Hess — 1991 Journal für die reine und angewandte Mathematik
Multiple solutions of some asymptotically linear elliptic boundary value problems Hess, P. — 1979 Equadiff IV
On stable solutions of quasilinear periodic-parabolic problems E. N. Dancer; P. Hess — 1987 Annali della Scuola Normale Superiore di Pisa - Classe di Scienze