VISHKI, H. R.; JABBARI, A. A class of distal functions on semitopological semigroups. Methods of Functional Analysis and Topology, [S. l.], v. 15, n. 2, p. 188–194, 2009. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/418. Acesso em: 16 dec. 2025.