Nontrivial solutions for an asymptotically linear Dirichlet problem. Cossio, Jorge; Vélez, Carlos — 2003 Revista Colombiana de Matemáticas
Explicit construction, uniqueness, and bifurcation curves of solutions for a nonlinear Dirichlet problem in a ball. Arango, Horacio; Cossio, Jorge — 2000 Electronic Journal of Differential Equations (EJDE) [electronic only]
A minimax principle, index of the critical point, and existence of sign-changing solutions to elliptic boundary value problems. Castro, Alfonso; Cossio, Jorge; Neuberger, John M. — 1998 Electronic Journal of Differential Equations (EJDE) [electronic only]
Multiple radial solutions for a semilinear Dirichlet problem in a ball Alfonso Castro; Jorge Cossio — 1993 Revista colombiana de matematicas