ZHUCHOK, Yu.; Toichkina О. Semigroup of weak endomorphisms of a partial equivalence relationship. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 76, n. 12, p. 1727–1737, 2025. DOI: 10.3842/umzh.v76i12.8412. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8412. Acesso em: 5 dec. 2025.