Three symmetric positive solutions for Lidstone problems by a generalization of the Leggett-Williams theorem. Avery, Richard I.; Davis, John M.; Henderson, Johnny — 2000 Electronic Journal of Differential Equations (EJDE) [electronic only]
Existence of a positive solution to a right focal boundary value problem. Avery, Richard I.; Henderson, Johny; Anderson, Douglas R. — 2010 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
Functional expansion-compression fixed point theorem of Leggett-Williams type. Anderson, Douglas R.; Avery, Richard I.; Henderson, Johnny — 2010 Electronic Journal of Differential Equations (EJDE) [electronic only]
Operator type expansion-compression fixed point theorem. Anderson, Douglas R.; Avery, Richard I.; Henderson, Johnny; Liu, Xueyan — 2011 Electronic Journal of Differential Equations (EJDE) [electronic only]