Marano, Salvatore A., and Nikolaos S. Papageorgiou. “Constant-Sign and Nodal Solutions for a Neumann Problem With $p$-Laplacian and Equi-Diffusive Reaction Term”. Topological Methods in Nonlinear Analysis 38, no. 2 (April 23, 2011): 233–248. Accessed July 22, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2011.030.