ZUBRILIN, K. M. On Preservation of the Order of Flattening by an Induced Diffeomorphism. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 65, n. 11, p. 1482–1497, 2013. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2528. Acesso em: 5 dec. 2025.