Localized solutions of elliptic equations: loitering at the hilltop. Iaia, Joseph A. — 2006 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
Exact multiplicity of positive solutions in semipositone problems with concave-convex type nonlinearities. Gadam, Sudhasree; Iaia, Joseph A. — 2001 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]