00285nam a2200133Ia 45000030006000000080041000060400015000471000016000622450025000782500010001032600009001135460012001220050017001340STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aGupta, P.P.  aMathematical physics  aFirst  c1970  aEnglish20220125170121.0