MustafaevaR., and KhusainovD. Ya. “Robust Stability of Systems With Delay”. Ukrains’kyi Matematychnyi Zhurnal 47, no. 6 (June 25, 1995): 859–863. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5479.