Akturk, S., and A. Ashyralyev. “The Structure of Fractional Spaces Generated by the Two-dimensional difference Operator on the Half Plane”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 8 (August 25, 2018): 1019-1032. Accessed September 30, 2022. http://umj.imath.kiev.ua/index.php/umj/article/view/1614.