Ambrosetti, Antonio, and David Arcoya. “On a Quasilinear Problem at Strong Resonance”. Topological Methods in Nonlinear Analysis 6, no. 2 (December 1, 1995): 255–264. Accessed July 22, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.1995.044.