Чуйко, С. М., and Я. В. Калиниченко. “On the Regularization of the Cauchy Problem for a System of Linear Difference Equations”. Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics, Vol. 88, Dec. 2018, pp. 27-34, doi:10.26565/2221-5646-2018-88-03.