Sitnikov, V. S., P. V. Stupen, and I. V. Baderko. “Obtaining a Digital Filter Structure from State-Space Description”. Technology and Design in Electronic Equipment, no. 4–5, Oct. 2002, pp. 21-23, https://www.tkea.com.ua/index.php/journal/article/view/TKEA2002.4-5.21.