Ostapenko, V. V., and G. S. Finin. “Methods for the Elimination of Unknowns from Systems of Linear Inequalities and Their Applications”. Ukrains’kyi Matematychnyi Zhurnal 53, no. 1 (January 25, 2001): 50-56. Accessed June 21, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4220.