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RAO (B V Narayana), . (1989). Problems in physics. II PUC. Delhi: Himalaya Publishing House.
RAO (B V Narayana), . 1989. Problems in physics. II PUC. Delhi: Himalaya Publishing House.
RAO (B V Narayana), . Problems in physics. II PUC. Delhi: Himalaya Publishing House. 1989.