Ali, N. A., and S. V. Yanchuk. “Conditions for Exponential Stability and Dichotomy of Pulse Linear Extensions of Dynamical Systems on a Torus”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 50, no. 3, Mar. 1998, pp. 451–453, https://umj.imath.kiev.ua/index.php/umj/article/view/4948.