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by T.S.Ramakrishnan | .
by A.M. Wadhwani | .
by M. S. Randhawa | .
by K. C. Naik | .
by Hans Jenny | .
by M.S. Randhawa | .
by S.L. Jindal | .
by O.P. Pareek | .
by S. K. Ranjhan | .
by S.P. Raychaudhuri | .
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