Gorbachuk, T.V. and Perestyuk, N.A. (1997) “On the existence of discontinuous limit cycles for one system of differential equations with pulse influence”, Ukrains’kyi Matematychnyi Zhurnal, 49(8), pp. 1127–1134. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5105 (Accessed: 5 December 2025).