00305nam a2200121Ia 4500008004100000020001800041041000800059082001200067100001600079245004500095260003500140300000800175230718s2005    xx            000 0 und d  a81-8147-003-6  aeng  a617.752  aKHURANA A K  aTHEORY & PRACTICE OF OPTICS & REFRACTION  bElsevier A diviison Reedc2005  a347