Kostov, V. P. “Real Univariate Polynomials With Given Signs of Coefficients and Simple Real Roots”. Matematychni Studii 61, no. 1 (March 19, 2024): 22-34. Accessed May 10, 2024. http://www.matstud.org.ua/ojs/index.php/matstud/article/view/427.