1. Algebraic Theory for Multivariable Linear Systems;Blomberg,1983
2. Linear Systems;Kailath,1980
3. Integral Matrices;Newman,1972
4. Proper elimination of latent variables;Polderman,1993
5. J.W. Polderman, J.C. Willems, Introduction to Mathematical Systems Theory: A Behavioral Approach, Texts in Applied Mathematics 26, Springer, New York.