[1]
M. Ilolov and A. M. Samoilenko, “Invariant tori of differential equations in a Banach space”, Ukr. Mat. Zhurn., vol. 50, no. 1, pp. 13–21, Jan. 1998, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4968