BENDIFFALAH, B. Suite exacte de Mayer-Vietoris d’une extension triangulaire. Mathematica Scandinavica, Berkeley, CA, United States, v. 103, n. 2, p. 186–207, 2008. DOI: 10.7146/math.scand.a-15077. Disponível em: https://journals.msp.org/mscand/article/view/620. Acesso em: 24 jul. 2026.