POLULYAKH, E. A. On imbedding of closed 2-dimensional disks into $ R^{2}$. Methods of Functional Analysis and Topology, [S. l.], v. 4, n. 2, p. 76–94, 1998. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/62. Acesso em: 19 dec. 2025.