Samoilenko A. M. (1992) “Investigation of a discrete dynamical system in the vicinity of quasi-periodic trajectory ”, Ukrains’kyi Matematychnyi Zhurnal, 44(12), pp. 1702-1711. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/8195 (Accessed: 27July2024).