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by Sharma, L.K.
by Chopra, R.H.
by Marter, A.D.
by Sharma, M.R.
by Atal, C.K.
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by Kerkut, G.A. ed.
by Bodenheimer, F.S; .
by Ross, I.A.
by Vavilov.
by Dev, Sukh.
by हॉकिंग, स्टीफेन (Hawking, Stephen).