GERKO, A. I. On Some Disjointness Classes of Extensions of Minimal Topological Transformation Semigroups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 52, n. 10, p. 1335–1344, 2000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4540. Acesso em: 5 dec. 2025.