CANILANG, S.; COHEN, M. P.; GRAESE, N.; SEONG, I. The closure-complement-frontier problem in saturated polytopological spaces. New Zealand Journal of Mathematics, [S. l.], v. 51, p. 3–27, 2021. DOI: 10.53733/151. Disponível em: https://nzjmath.org/index.php/NZJMATH/article/view/151. Acesso em: 31 dec. 2024.