REZAEI, A.; KIM, H. S.; SAEID, A. B. Independence concepts for groupoids. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 22, p. 87–98, 2023. Disponível em: https://studmath.up.krakow.pl/article/view/10432. Acesso em: 3 mar. 2024.