Samoilenko AM, Teplinsky YV. Invariant tori of linear countable systems of discrete equations given on an infinite-dimensional torus. Ukr. Mat. Zhurn. [Internet]. 1998Feb.25 [cited 2024Oct.6];50(2):244–251. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4958