1. M. Ahmadi, A.G. Constantinides and R.A. King, “Design technique for a class of stable two-dimensional recursive digital filters, ” Proc. IEEE Int’l Conf. on Acoustics, Speech and Signal Processing, pp. 145–147, 1976.
2. R. Ansari, “A simple derivation for the synthesis procedure for 90° fan filters,” IEEE Trans. on Circuits and Systems, vol. CAS-32, pp. 107–108, January 1985.
3. R. Ansari, “Elliptical filter design for a class of generalized halfband filters,” IEEE Trans. on Acoustics, Speech and Signal Processing, Vol. ASSP-33, pp. 1146–1150, October 1985.
4. A. Antoniou and W-S. Lu, “Design of 2-D nonrecursive filters using window method,” IEE Proc. vol. 137, Part G, pp. 247–250, August 1990.
5. S. Chakrabarti and S.K. Mitra, “Design of two-dimensional digital filters via spectral transformation,” Proc.IEEE, pp. 905–914, June 1977.