Martynyuk, D.I., Mitropolskiy, Y.A. and Tynnyi, V.I. (1993) “Reducibility of linear systems of difference equations with almost periodic coefficients”, Ukrains’kyi Matematychnyi Zhurnal, 45(12), pp. 1661–1667. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5974 (Accessed: 5 December 2025).