ZubrilinK. M. (2013) “On Preservation of the Order of Flattening by an Induced Diffeomorphism”, Ukrains’kyi Matematychnyi Zhurnal, 65(11), pp. 1482–1497. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2528 (Accessed: 23November2024).