00242nam a2200097Ia 4500008004100000041000800041082001900049100001200068245002600080260003800106211209s1973    xx            000 0 und d  aeng  a530.15 N73 BUL  aGOSWAMI  aMATHEMATICAL PHYSICS   aNEW DELHIbCENGAGE LEARNINGc1973