KHURANA A.K, . (2008). THEORY & PRACTICE OF OPTICS & REFRACTION. : Elsevier.
KHURANA A.K, . 2008. THEORY & PRACTICE OF OPTICS & REFRACTION. : Elsevier.
KHURANA A.K, . THEORY & PRACTICE OF OPTICS & REFRACTION. : Elsevier. 2008.