Matviichuk, K. S. “On Sufficient Conditions for the Technical Stability of Controlled Processes With Lumped Parameters”. Ukrains’kyi Matematychnyi Zhurnal 50, no. 10 (October 25, 1998): 1352–1358. Accessed May 19, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4821.