PolulyakhE. O. (2015) “Kronrod–Reeb Graphs of Functions on Noncompact Two-Dimensional Surfaces. II”, Ukrains’kyi Matematychnyi Zhurnal, 67(10), pp. 1398-1408. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2075 (Accessed: 21November2024).