KURINNYI, G. Ch. Congruences and quasiidentities on unars. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 6, p. 852–856, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5072. Acesso em: 6 dec. 2025.