Skripnik, N. V. “Periodic Solutions of Linear Impulsive Differential Inclusions”. Ukrains’kyi Matematychnyi Zhurnal 60, no. 9 (September 25, 2008): 1287–1296. Accessed April 19, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3244.