1. A semilinear equation in L1(RN);Bénilan;Ann. Scuola Norm. Sup. Cl. Sci. Pisa,1975
2. Sublinear singular elliptic problems with two parameters;Ghergu;J. Differential Equations,2003
3. Elliptic Partial Differential Equations of Second Order;Gilbarg,1983
4. Regularity of an elliptic problem with a singular nonlinearity;Gui;Proc. Roy. Soc. Edinburgh Sect. A,1993
5. The Analysis of Linear Partial Differential Operators I;Hörmander,1983