KARANDZHULOV, L. I. Multipoint boundary-value problems with pulse effects. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 6, p. 770–774, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5470. Acesso em: 14 apr. 2025.