Budnyts’ka, T. V. and Prishlyak, O. O. (2009) “Equivalence of closed 1-forms on surfaces with edge”, Ukrains’kyi Matematychnyi Zhurnal, 61(11), pp. 1455-1473. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3114 (Accessed: 27April2024).