1. Positive solution of elliptic nonpositone problems;Allegretto;Differential Integral Equations,1992
2. Existence and nonexistence of radially symmetric nonnegative solutions for a class of semipositone problems in an annulus;Arcoya;Rend. Mat.,1994
3. Positive solutions for some semipositone problems via bifurcation theory;Ambrosetti;Differential Integral Equation,1994
4. Existence results for nonautonomous elliptic boundary value problems;Anuradha;Electron. J. Differential Equations,1994
5. Existence results for superlinear semipositone BVPs;Anuradha;Proc. Amer. Math. Soc.,1996