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Sen, Prodip and Chidambara, MR (1980) Observability for a Class of Nonlinear Systems. In: Ieee Transactions On Automatic Control, 25 (6). pp. 1236-1237.
Sen, Prodip and Chidambara, MR (1979) Dolezal's theorem revisited. In: Mathematical Systems Theory, 13 (1). pp. 67-79.