Kumar U, Tiwari S. Multiple solutions to Bahri-Coron problem involving fractional $p$-Laplacian in some domain with nontrivial topology. TMNA [Internet]. 2023 Jun. 23 [cited 2024 Jul. 22];61(2):717-42. Available from: https://apcz.umk.pl/TMNA/article/view/44694