NYKOROVYCH, S.I. Approximation relations on the posets of pseudometrics and of pseudoultrametrics. Carpathian Mathematical Publications, [S. l.], v. 8, n. 1, p. 150–157, 2016. DOI: 10.15330/cmp.8.1.150-157. Disponível em: https://scijournals.pnu.edu.ua/index.php/cmp/article/view/1420. Acesso em: 29 apr. 2024.