Univariate polynomials and the contractability of certain sets. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 107, p. 81–105, 2020. DOI: 10.60063/gsu.fmi.107.81-105. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/106. Acesso em: 14 dec. 2025.