BoichukО. A. (2001) “A Condition for the Existence of a Unique Green–Samoilenko Function for the Problem of Invariant Torus”, Ukrains’kyi Matematychnyi Zhurnal, 53(4), pp. 556-559. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4277 (Accessed: 19May2024).