A nonrealization theorem in the context of Descartes’ rule of signs. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 106, p. 25–51, 2019. DOI: 10.60063/gsu.fmi.106.25-51. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/26. Acesso em: 15 dec. 2025.