1. Positive solutions for some semi-positone problems via bifurcation theory;Ambrosetti;Differential Integral Equations,1994
2. Existence and non-existence of radially symmetric non-negative solutions for a class of semi-positone problems in an annulus;Arcoya;Rend. Mat. Appl. (7),1994
3. Nonnegative solutions for a class of nonpositone problems;Castro;Proc. Roy. Soc. Edinburgh Sect. A,1988
4. Positive solutions for a concave semipositone Dirichlet problem;Castro;Nonlinear Anal.,1998
5. Uniqueness of stable and unstable positive solutions for semipositone problems;Castro;Nonlinear Anal.,1994