Domoshnitsky A, Mizgireva I, Raichik V. Semi-nonoscillation intervals and sign-constancy of Green’s functions of two-point impulsive boundary-value problems. Ukr. Mat. Zhurn. [Internet]. 2021 Jul. 20 [cited 2025 Apr. 23];73(7):887-901. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/473