GANSTER, M. A NOTE ON EXTENSIONS GENERATED BY CLOSED SETS. Tamkang Journal of Mathematics, [S. l.], v. 26, n. 2, p. 125–129, 1995. DOI: 10.5556/j.tkjm.26.1995.4386. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4386. Acesso em: 2 may. 2024.