[1] F. M. Callier, C. A. Desoer: Multivariable Feedback Systems. Springer-Verlag, New York 1982.
[2] S. L. Cambell: Singular Systems of Differential Equations. Pitman, London 1980.
[3] S. L. Cambell C. D. Meyer, N. Rose: 
Applications of the Drazin inverse to linear systems of differential equations with singular constant coefficients. SIAM J. Appl. Math. 31 (1976), 3, 411-425. 
MR 0431636 
[4] D. Cobb: 
Feedback and Pole placement in descriptor-variable systems. Internat. J. Control 33 (1981), 6, 1135-1146. 
MR 0624176 | 
Zbl 0464.93039 
[5] D. Cobb: 
A further interpretation of inconsistent initial conditions in descriptor variable systems. IEEE Trans. Automat. Control AC-28 (1983), 9. 
MR 0712957 | 
Zbl 0522.93037 
[6] D. Cobb: 
On the solution of linear differential equations with singular coefficients. J. Differential Equations 46 (1982), 310-323. 
MR 0681226 
[7] N. Cohen: 
Spectral analysis of regular matrix polynomials. Integral Equations Operator Theory 6 (1983), 161-183. 
MR 0720106 | 
Zbl 0521.15015 
[8] F. Lewis: 
A survey of linear singular systems. Circuits Systems Signal Process. 5 (1986), 1. 
MR 0893725 | 
Zbl 0613.93029 
[9] D. G. Luenberger: 
Dynamic systems in descriptor form. IEEE Trans. Automat. Control AC-22 (1977), 312-321. 
MR 0479482 
[11] H. H. Rosenbrock: 
Structural Properties of Linear dynamical systems. Internat. J. Control 20 (1974), 2, 191-202. 
MR 0424303 | 
Zbl 0285.93019 
[12] A. I. G. Vardulakis: 
Linear Multivariable Control: Algebraic Analysis and Synthesis Methods. Wiley, New York 1991. 
MR 1104222 | 
Zbl 0751.93002 
[13] A. I. G. Vardulakis, G. F. Fragulis: 
Infinite elementary divisors of polynomial matrices and impulsive solutions of linear homogeneous matrix differential equations. Circuits Systems Signal Process. 8 (1989), 3, 357-373. 
MR 1015177 | 
Zbl 0678.34002 
[14] G. Verghese: Infinite-frequency Behaviour in Dynamical Systems. Ph.D. Dissertation, Dept. Electrical Engineering, Stanford Univ. 1978.
[15] G. Verghese B. C. Levy, T. Kailath: 
A generalized state-space for singular systems. IEEE Trans. Automat. Control AC-26 (1981), 4, 811-830. 
MR 0635842 
[16] G. Verghese, T. Kailath: Impulsive behaviour in dynamical systems: Structure and significance. In: Proc. 4th Internat. Symp. Mathematical Theory of Networks and Systems, Delft 1979, The Netherlands, pp. 162-168.
[17] L. Gohberg P. Lancaster, L. Rodman: 
Matrix Polynomials. Academic Press, New York 1982. 
MR 0662418