KITAZAWA, N. On Reeb graphs induced from smooth functions on 3-dimensional closed manifolds with finitely many singular values. Topological Methods in Nonlinear Analysis, [S. l.], v. 59, n. 2B, p. 897–912, 2022. DOI: 10.12775/TMNA.2021.044. Disponível em: https://apcz.umk.pl/TMNA/article/view/38706. Acesso em: 19 apr. 2024.