LysenkoZ. M., MatviyukL. V., NechaevL. V., & ShvetsV. T. (2011). On the fredholm theory of a planar problem with shift for a pair of functions. Ukrains’kyi Matematychnyi Zhurnal, 63(4), 566-571. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/2742