Conti, Monica, and Filippo Gazzola. “Positive Entire Solutions of Quasilinear Elliptic Problems via Nonsmooth Critical Point Theory”. Topological Methods in Nonlinear Analysis 8, no. 2 (December 1, 1996): 275–294. Accessed March 29, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.1996.033.