[1]
Kitazawa, N. 2023. On Reeb graphs induced from smooth functions on $3$-dimensional closed manifolds which may not be orientable. Methods of Functional Analysis and Topology. 29, 1-2 (Mar. 2023), 57–72. DOI:https://doi.org/https://doi.org/10.31392/MFAT-npu26_1–2.2023.05.