Generalized Green operator for an impulsive boundary-value problem with switchings. Neliniini Kolyvannya, [S. l.], v. 10, n. 1, p. 51–65, 2007. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/420. Acesso em: 21 jan. 2026.