DOMOSHNITSKY, A.; MIZGIREVA, Iu.; RAICHIK, V. Semi-nonoscillation intervals and sign-constancy of Green’s functions of two-point impulsive boundary-value problems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 73, n. 7, p. 887–901, 2021. DOI: 10.37863/umzh.v73i7.473. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/473. Acesso em: 27 apr. 2025.