WojtowiczB., and KulikV. L. “Linear Extensions of Dynamical Systems on a Torus That Possess Green-Samoilenko Functions”. Ukrains’kyi Matematychnyi Zhurnal 50, no. 2 (February 25, 1998): 178–188. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4953.