00277nam a2200121Ia 4500008004100000082000800041082001000049100001900059245003100078260001000109260002700119260000900146230118s9999||||xx |||||||||||||| ||und||  a535  bPRA/O  asatyabprakash 0aoptics and atomic physics   adelhi  bratan prakashan mandir  c1980