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Zvelebil, Kamil, "From Proto-South Dravidian to Tamil and Old Malayalam", Proceedings of the Second International Conference Seminar of Tamil Studies - Volume One : Second International Conference Seminar of Tamil Studies, Madras, India, 3 - 10 January 1968. Edited by Asher, R. E., International Association of Tamil Research - Madras, October 1971, 54-72.
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