ARNAUTOV , V. I.; ZELENYUK , E. G. Problem of completeness of maximal topological groups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 43, n. 1, p. 21–27, 1991. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9300. Acesso em: 6 dec. 2025.