PrishlyakO. O. “Topological Equivalence of Morse–Smale Vector Fields With Beh2 on Three-Dimensional Manifolds”. Ukrains’kyi Matematychnyi Zhurnal 54, no. 4 (April 25, 2002): 492-500. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4087.