LI, Fengling; LEI, Fengchun; YANG, Guoqiu. Some Sufficient Conditions for Heegaard Genera to Be Additive Under Annulus Sum. MATHEMATICA SCANDINAVICA, [S. l.], v. 115, n. 2, p. 173–188, 2014. DOI: 10.7146/math.scand.a-19221. Disponível em: https://www.mscand.dk/article/view/19221. Acesso em: 5 dec. 2025.