1.
Zubrilin KM. On Preservation of the Order of Flattening by an Induced Diffeomorphism. Ukr. Mat. Zhurn. [Internet]. 2013Nov.25 [cited 2021Jan.26];65(11):1482–1497. Available from: http://umj.imath.kiev.ua/index.php/umj/article/view/2528