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082 _a617.7
_bKHO
100 _aA K Khurana
245 0 _aTheory And Practice Of Optics And Refraction
250 _a3rd
260 _bElservier
_c2014
300 _a439p.
650 _a Ophthalmology
942 _cBK
999 _c2831
_d2831