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Singhal R. L., . (2005). Solid State Physics. N.Delhi: Kedar Nath Ram Nath and Co. Meerut.
Singhal R L, . 2005. Solid State Physics. N.Delhi: Kedar Nath Ram Nath and Co. Meerut.
Singhal R L, . Solid State Physics. N.Delhi: Kedar Nath Ram Nath and Co. Meerut. 2005.