SKORDEV, D. A separation theorem of Y. Tagamlitzki in its natural generality. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 91, p. 73–78, 1999. Disponível em: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/270. Acesso em: 17 jun. 2024.