References
- Jury, E. I., Theory and application of the Z-transform method (John Wiley & Sons Inc., New York), 1964, 189.
- Meserve, W. E. & Torng, H. C., Trans. ASME, J. Basic Engineering, March 1961, 77.
- Boudarel, R., Guichet, P. & Senouillet, G., Progress in control engineering, 3 (Heywood Books), 1966, 133.
- Nagrath, I. J. & Gopal. M., Compulation of self-sustained oscillations in relay control systems, Proceedings of Symposium, Network, Systems and Controls, I.I.T., Delhi, 3–5 December, 1970.
- Kovatch, G., IEEE Trans. Automatic Control, AC-8, Oct. 1963.
- Katsuhiko Ogata, Modern Control Engineering (Prentice Hall Inc.), 1970, 703.