Marti, Jean-Andre, and Silvère P. Nuiro. “Analyse algébrique d’un probléme De Dirichlet Non linéaire Et Singulier”. Topological Methods in Nonlinear Analysis 13, no. 2 (June 1, 1999): 301–311. Accessed March 28, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.1999.016.