Hakobian, L. V. “NONNUMERIC ROOTS OF THE ALGEBRAIC EQUATIONS”. Proceedings of the YSU A: Physical and Mathematical Sciences 41, no. 2 (213) (June 15, 2007): 23–34. Accessed September 20, 2024. https://pub.ysu.am/index.php/proceedings-phys-math/article/view/vol41_no2_2007_pp023-034.