ADAMENKO, N. P.; VELICHKO, I. G. Classification of topologies on finite sets using graphs. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 7, p. 992–996, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3215. Acesso em: 5 dec. 2025.