Bahrouni, S., H. Ounaies, and L. . S. Tavares. “Basic Results of Fractional Orlicz-Sobolev Space and Applications to Non-Local Problems”. Topological Methods in Nonlinear Analysis, vol. 55, no. 2, June 2020, pp. 681-95, https://apcz.umk.pl/TMNA/article/view/TMNA.2019.111.