LysenkoZ. M., MatviyukL. V., NechaevL. V., and ShvetsV. T. “On the Fredholm Theory of a Planar Problem With Shift for a Pair of Functions”. Ukrains’kyi Matematychnyi Zhurnal 63, no. 4 (April 25, 2011): 566-571. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2742.