RogovchenkoY. V. (1993) “Periodic solutions of pulse evolutionary systems with unbounded nonlinearities”, Ukrains’kyi Matematychnyi Zhurnal, 45(10), pp. 1390–1397. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5944 (Accessed: 6October2024).