Chabrowski, Jan, and Shusen Yan. “The Effect of the Graph Topology on a Semilinear Elliptic Equation With Critical Exponent”. Topological Methods in Nonlinear Analysis 12, no. 1 (September 1, 1998): 1–26. Accessed April 26, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.1998.025.