Perera, Kanishka, and Caterina Sportelli. “A Multiplicity Result for Critical Elliptic Problems Involving Differences of Local and Nonlocal Operators”. Topological Methods in Nonlinear Analysis 63, no. 2 (June 16, 2024): 717–731. Accessed July 22, 2024. https://apcz.umk.pl/TMNA/article/view/52724.