[1] L. A. Zadeh C. A. Desoer: Linear system theory. McGraw-Hill, New York 1963.

[2] R. E. Kalman: Mathematical description of linear dynamical systems. Journal SIAM Control 1 (1963), 2, 152-192. MR 0152167 | Zbl 0145.34301

[3] K. Ogata: State space analysis of control systems. Prentice Hall, N. J. 1967. Zbl 0178.09801

[4] R. W. Brockett: Poles, zeros and feedback: State space interpretation. IEEE Trans. Aut. Control AC-10 (1965), 2, 129-135.

[5] E. Kreindler P. E. Sarachick: On the concepts of controllability and observability of linear systems. IEEE Trans. Aut. Control AC-9 (1964), 2, 129-136. MR 0189852

[6] J. H. Milsum: Biological control systems analysis. McGraw-Hill, New York 1966.

[7] M. Berman: Kinetic modeling in physiology. FEBS Letters 2 (1969, March), S56- S57.