1.
Gorbachuk TV, Perestyuk NA. On the existence of discontinuous limit cycles for one system of differential equations with pulse influence. Ukr. Mat. Zhurn. [Internet]. 1997Aug.25 [cited 2024May19];49(8):1127–1134. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5105