FELLER, M. N. Cauchy problem for non-linear equations involving the Levy laplacian with separable variables. Methods of Functional Analysis and Topology, [S. l.], v. 5, n. 4, p. 9–14, 1999. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/103. Acesso em: 17 dec. 2025.