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://gsp.tricubic.dev/cmr/article/view/8648. Acesso em: 15 mar. 2026.