NOMIROVS'KII, D. A. On Homeomorphisms Realized by Certain Partial Differential Operators. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 12, p. 1707–1716, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3878. Acesso em: 11 apr. 2025.