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Makur, Anamitra and Murthy, Narayana VL (1997) Design of two-dimensional directional filters. In: Signal Processing, 60 (3). pp. 315-324.
Murthy, Narayana VL and Makur, A (1996) Design of some 2-D filters through the transformation technique. In: IEE Proceedings - Vision, Image and Signal Processing, 143 (3). pp. 184-190.