1. Nonlinear superlinear singular and nonsingular second order boundary value problems;Agarwal;J. Differential Equations,1998
2. Singular initial value problems with sign changing nonlinearities;Agarwal;IMA J. Appl. Math.,2000
3. J.M. Davis, L.H. Erbe, J. Henderson, Multiplicity of positive solutions for higher order Sturm-Liouville problems, preprint.
4. Multiplicity of positive solutions for a nonlinear differential equation with nonlinear boundary conditions;Dunninger;Ann. Polonici Math.,1998
5. Existence and multiplicity of positive solutions to nonlinear boundary value problems;Erbe;Differential Equations Dyn. Systems,1996