KUMAR, V.; KUMAR, N. Sh.; SARMA, R. Unbounded translation invariant operators on commutative hypergroups. Methods of Functional Analysis and Topology, [S. l.], v. 25, n. 3, p. 236–247, 2019. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/729. Acesso em: 16 dec. 2025.