Kulik, V. L., and L. Kulik. “Regular Linear Extensions of Dynamical Systems on a Torus ”. Ukrains’kyi Matematychnyi Zhurnal 45, no. 8 (August 25, 1993): 1170–1173. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5916.