00290nam a2200121Ia 4500008004100000020001800041041000800059082001200067100001600079245004500095260002000140300000800160230718s2006    xx            000 0 und d  a81-8147-003-6  aeng  a617.752  aKHURANA A K  aTHEORY & PRACTICE OF OPTICS & REFRACTION  bElsevier c2006  a347