Non-linear initial data for second and higher order semi-linear elliptic equations. James Conlan; Robert P. Gilbert — 1975 Journal für die reine und angewandte Mathematik
Iterative schemes for almost linear eppiptic systems with nonlinear initial data. James Conlan; Robert P. Gilbert — 1975 Journal für die reine und angewandte Mathematik
Existence of weak solutions for a nonlinear elliptic system. Fang, Ming; Gilbert, Robert P. — 2009 Boundary Value Problems [electronic only]