00274nam a2200109Ia 4500008004100000041001200041100001300053245003500066260004000101300000800141650001500149221030s9999    xx            000 0 und d  aEnglish  aS. Gupta 0aObjectice Physicscby S. Gupta  bJai prakash Nath Pub.aMeerutc1995  a696  aBB Physics