SELEZNEVA, N. V. Mathematical modeling of nilpotent subsemigroups of semigroups of contracting transformations of a Boolean. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 61, n. 7, p. 976–985, 2009. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3072. Acesso em: 5 dec. 2025.