KarandzhulovL. I. “Generalized Green’s Matrix for Linear Pulse Boundary-Value Problems”. Ukrains’kyi Matematychnyi Zhurnal 46, no. 7 (July 25, 1994): 849–856. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5676.