A separation theorem of Y. Tagamlitzki in its natural generality. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 91, p. 73–78, 1999. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/270. Acesso em: 4 feb. 2026.