Valeyev, K. G., and I. A. Dzhalladova. “Criteria for the Asymptotic Stability of Solutions of Dynamical Systems”. Ukrains’kyi Matematychnyi Zhurnal 52, no. 12 (December 25, 2000): 1702-1707. Accessed January 15, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/4573.