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Ravishankar, MK and Hari, KVS (2004) Performance Analysis of Goertzel’s Algorithm based Dual-Tone Multifrequency (DTMF) Detection Schemes. 1.
Ravishankar, MK and Satyam, M (1996) Optically/Electrically (Symmetrically) Triggerable Bistable Multivibrator. In: IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, 43 (7). 610 -612.