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 Oppenheim, A.V., and R.W. Schafer, Discrete-Time Signal Processing, Prentice-Hall, 1989.
 Shajaan, M., and J. Sorensen, “Time-Area Efficient Multiplier-Free Recursive Filter Architectures for FPGA Implementation,” IEEE International Conference on Acoustics, Speech, and Signal Processing, 1996, pp. 3269-3272.