KOSTOV, V. Univariate polynomials and the contractability of certain sets. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 107, p. 81–105, 2020. DOI: 10.60063/gsu.fmi.107.81-105. Disponível em: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/106. Acesso em: 29 apr. 2024.