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SEHGAL (D L) & others, . (1972). Modern physics. N D: S. Chand & Co. Ltd.
SEHGAL (D L) & others, . 1972. Modern physics. N D: S. Chand & Co. Ltd.
SEHGAL (D L) & others, . Modern physics. N D: S. Chand & Co. Ltd. 1972.