Chaikovs’kyiA. V., and Lagoda O. A. “Bounded Solutions of a Difference Equation in Banach Space With Input Data in Subspaces”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 73, no. 11, Nov. 2021, pp. 1564 -75, doi:10.37863/umzh.v73i11.6692.