TORBA, S. M.; KUZHEL, S. A. $p$-Adic fractional differentiation operator with point interactions. Methods of Functional Analysis and Topology, [S. l.], v. 13, n. 2, p. 169–180, 2007. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/346. Acesso em: 16 dec. 2025.