BilenkoV. I., BozhonokK. V., & DzyadykS. Y. (2019). Piecewise-polynomial approximations for the solutions of impulsive differential equations. Ukrains’kyi Matematychnyi Zhurnal, 71(2), 168-179. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/1429