KITAZAWA, N. On Reeb graphs induced from smooth functions on closed or open manifolds. Methods of Functional Analysis and Topology, [S. l.], v. 28, n. 2, p. 127–143, 2022. DOI: https://doi.org/10.31392/MFAT-npu26_2.2022.05. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/826. Acesso em: 15 dec. 2025.