Domoshnitsky, A. et al. 2021. Semi-nonoscillation intervals and sign-constancy of Green’s functions of two-point impulsive boundary-value problems. Ukrains’kyi Matematychnyi Zhurnal. 73, 7 (Jul. 2021), 887–901. DOI:https://doi.org/10.37863/umzh.v73i7.473.