Kumar, Uttam, and Sweta Tiwari. “Multiple Solutions to Bahri-Coron Problem Involving Fractional $p$-Laplacian in Some Domain With Nontrivial Topology”. Topological Methods in Nonlinear Analysis 61, no. 2 (June 23, 2023): 717–742. Accessed July 22, 2024. https://apcz.umk.pl/TMNA/article/view/44694.