00287nam a2200121Ia 45000030006000000080041000060400015000471000028000622450037000902600009001275460012001360050017001480STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aRamachandra Punth, A.S.  aMathematical problems in physics  c1981  aEnglish20220125170121.0