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KHURANA A. K, . (2011). THEORY & PRACTICE OF OPTICS & REFRACTION. : Elsevier.
KHURANA A. K, . 2011. THEORY & PRACTICE OF OPTICS & REFRACTION. : Elsevier.
KHURANA A. K, . THEORY & PRACTICE OF OPTICS & REFRACTION. : Elsevier. 2011.