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Krishnamurthy, EV and Subramanian, K and Rao, TM and Srinivasan, S (1974) Formal description, compression and transformation of digital pictures II. Picture algebra and geometry. In: Proceedings Mathematical Sciences, 79 (4). pp. 195-211.
Krishnamurthy, EV and Subramanian, K and Rao, TM (1974) Formal description, compression and transformation of digital pictures. In: Proceedings Mathematical Sciences, 79 (3). pp. 139-158.