Cassani, Daniele, João Marcos do Ó, and Jianjun Zhang. “Multi-Bump Solutions for Singularly Perturbed Schrödinger Equations in $\mathbb{R}^2$ With General Nonlinearities”. Topological Methods in Nonlinear Analysis 49, no. 1 (October 27, 2016): 205–231. Accessed July 22, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2016.074.