HAJIBAYOV, M. G. The Welland inequality on hypergroups. Methods of Functional Analysis and Topology, [S. l.], v. 25, n. 2, p. 134–141, 2019. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/717. Acesso em: 13 dec. 2025.