Zhuravlev, V. P., N. P. Fomin, and P. N. Zabrodskiy. “Conditions of Solvability and Submission of Solutions of Equations With Operator Matrix in Banach Spaces”. Ukrains’kyi Matematychnyi Zhurnal 71, no. 4 (July 19, 2023): 471-485. Accessed May 21, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/305.