Ali, N.A. and Yanchuk, S.V. (1997) “Rotary motions of autonomous systems with pulse influence”, Ukrains’kyi Matematychnyi Zhurnal, 49(4), pp. 591–596. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5036 (Accessed: 14 April 2025).