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Sundareshan, MK and Thathachar, M (1973) Time-domain criteria for theL_{2}-stability of nonstationary feedback systems. In: IEEE Transactions on Automatic Control, 18 (1). pp. 80-81.
Bhat, SJ (1966) A Note on Averaging Circuits. In: IEEE Transactions on Automatic Control, 11 (4). p. 770.