By D.Srinivasa Krishna
C.V.R.K. Prasad
Dr. B V Pattabhiram
Devarakonda Seshagiri Rao
M.Stoliar And L.Fomin (Translated By K.V.S.Gnaneswara Rao)
Bhupati Rama Rao
Balala Science Vignanam
Parragon
Dr. Nagasuri Venugopal
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