1. W. Leontiefet al., Studies in the Structure of the American Economy, Oxford University Press, New York, 1953.
2. L.O. Chua and P.M. Lin,Computer-Aided Analysis of Electronic Circuits, Prentice-Hall Inc., New Jersey, 1975.
3. B. Dziurla and R.W. Newcomb: “The Drazin Inverse and Semistate Equations,”Proc. International Symposium on Mathematical Theory of Networks and Systems, Delft, July 1979, pp. 283–289.
4. R.W. Newcomb, “The Semistate Description of Nonlinear Time-Variable Circuits,”IEEE Trans. on Circuits and Systems, Vol.CAS-28, No. 11, Jan. 1981, pp. 62–71.
5. S.L. Campbell,Singular Systems of Differential Equations, Pitman Advanced Publishing Program, London, 1980.