Dancer, E. Norman, and Shusen Yan. “Effect of the Domain Geometry on the Existence of Multipeak Solutions for an Elliptic Problem”. Topological Methods in Nonlinear Analysis 14, no. 1 (September 1, 1999): 1–38. Accessed July 22, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.1999.020.