Khusainov, D. Ya., and V. N. Shevelo. “Stability of Differential Systems With Rational Right-Hand Sides”. Ukrains’kyi Matematychnyi Zhurnal 47, no. 9 (September 25, 1995): 1295–1299. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5530.