By I.V.Petryanov
M.Stoliar And L.Fomin (Translated By K.V.S.Gnaneswara Rao)
N.Mohan Krishna
S.Venkatrao
Devanoori Bhanu Murthy
R.Natarajan (Prapancha Vaignanika Kathalu)
Dr. G.Samaram
E.Kommaraiah
.
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