Existence of an optimal control for differential systems with impulsive effects at nonfixed times. Neliniini Kolyvannya, [S. l.], v. 19, n. 4, p. 493–508, 2016. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/844. Acesso em: 8 dec. 2025.