1. D. R. Choudhury. Modern Control Engineering. India: Prentice Hall, 2005.
2. A. Tewari. Modern Control Design. New York: Wiley, 2003.
3. G. Benke, B. B. Wells. Estimates for the stability of low-pass filters. IEEE Transactions on Acoustics, Speech, and Signal Processing, 1985, 33(1): 98–105.
4. W. Lu. Design of recursive digital filters with prescribed stability margin: A parameterization approach. IEEE Transactions on Circuits and Systems-II: Analog and Digital Signal Processing, 1988, 45(9): 1289–1298.
5. J. O. Smith. Introduction to Digital Filters with Audio Applications. New York: Stanford Unversty, 2007.