B V Appa Rao, K A S N V Prasad, and Rachel Kezia. “Controllability and Observability of Kronecker Product Sylvester System on Time Scales”. Mathematical Journal of Interdisciplinary Sciences, Vol. 1, no. 1, July 2012, pp. 47-56, https://mjis.chitkara.edu.in/index.php/mjis/article/view/159.