1. A priori estimates and existence of positive solutions of semilinear elliptic equations;De;J. Math. pures appl.,1982
2. On positive solutions of nonlinear elliptic eigenvalue problems;Kuiper;Rc. mat. Circ. Palermo,1979
3. Positive solutions for a class of semilinear two-point boundary value problems;Sanchez;Bull. Aust. math. Soc.,1992
4. Eigenvalues of generalized Gel'fand models;Fink;Nonlinear Analysis,1993
5. Positive solution of a system of higher order boundary value problems;Chyan;Pan. Am. math. J.,1993