1. Campbell, S. L.,Singular Systems of Differential Equations II, New York: Pitman, 1982.
2. Cobb, D., Controllability, observability and duality in singular systems,IEEE Trans. Automat. Control. Vol. 29, pp. 1076–1082, 1984.
3. Dai, L.,Singular Control Systems, Lecture Notes in Control and Information Sciences, Berlin: Springer-Verlag, 1989.
4. Gantmacher, F. R.,Theory of Matrices, Vol. II, New York: Chelsea, 1960.
5. Shayman, M. A., and Z. Zhou, Feedback control and classification of generalized linear systems,IEEE Trans. Automat. Control, Vol. 32, pp. 483–494, 1987.