FELLER, M. N.; BELOPOLSKAYA, Ya. I.; ALBEVERIO, S. Riquier problem for nonlinear elliptic equations with Lévy Laplacians. Methods of Functional Analysis and Topology, [S. l.], v. 11, n. 1, p. 1–9, 2005. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/261. Acesso em: 16 dec. 2025.