MarchukN. A., & TeplinskyY. V. (2003). On the Fréchet Differentiability of Invariant Tori of Countable Systems of Difference Equations Defined on Infinite-Dimensional Tori. Ukrains’kyi Matematychnyi Zhurnal, 55(1), 75-90. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/3889