GorodniiM. F., and LagodaO. A. “Bounded Solutions for Some Classes of Difference Equations With Operator Coefficients”. Ukrains’kyi Matematychnyi Zhurnal 53, no. 11 (November 25, 2001): 1495-1500. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4369.