DzhumabaevD. S. “Necessary and Sufficient Conditions for the Solvability of Linear Boundary-Value Problems for the Fredholm Integrodifferential Equations”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 8 (August 25, 2014): 1074–1091. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2200.