A Sufficient Condition for the Genus of an Annulus Sum of Two 3-Manifolds to Be Non-Degenerate. Communications in Mathematical Research, [S. l.], v. 26, n. 1, p. 85–96, 2021. Disponível em: https://global-sci.com/index.php/cmr/article/view/8648. Acesso em: 5 dec. 2025.