POPUÅ£A, V.; IVAN, G. Morphisms of Vector Groupoids. Communications in Mathematics and Applications, [S. l.], v. 4, n. 1, p. 61–73, 2013. DOI: 10.26713/cma.v4i1.163. Disponível em: https://www.rgnpublications.com/journals/index.php/cma/article/view/163. Acesso em: 2 may. 2024.