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SINGHAL R., . (1989). Solid State Physics. N. Delhi: Kedar Nath Ram Nath and Co. Meerut.
SINGHAL RL, . 1989. Solid State Physics. N. Delhi: Kedar Nath Ram Nath and Co. Meerut.
SINGHAL RL, . Solid State Physics. N. Delhi: Kedar Nath Ram Nath and Co. Meerut. 1989.