Lou, Qingjun, Yupeng Qin, and Fang Liu. “The Existence of Constrained Minimizers Related to Fractional $p$-Laplacian Equations”. Topological Methods in Nonlinear Analysis 58, no. 2 (December 5, 2021): 657–676. Accessed July 22, 2024. https://apcz.umk.pl/TMNA/article/view/36414.