00247nam a2200109Ia 4500008004100000041000800041082001900049100001800068245003400086260000900120300000800129211209s1979    xx            000 0 und d  aeng  a530.15 N79 NAR  aNARASAPPAYA M  aADVANCED PROBLEMS IN PHYSICS   c1979  a542