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Krishnamurthy, EV and Ramachandran, Vijaya (1980) A cryptographic system based on finite field transforms. In: Proceedings Mathematical Sciences, 89 (2). 0973 -7685.
Ramachandran, Vijaya (1979) Exact Reduction of a Polynomial Matrix to the Smith Normal Form. In: IEEE Transactions on Automatic Control, 24 (4). pp. 638-641.