ÁVILA, J.; MARÍN, V. The Notions of Center, Commutator and Inner Isomorphism for Groupoids. Ingeniería y Ciencia, [S. l.], v. 16, n. 31, p. 7–26, 2020. DOI: 10.17230/ingciencia.16.31.1. Disponível em: https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/6260. Acesso em: 25 apr. 2024.