00293nam a2200133Ia 45000030006000000080041000060400015000471000024000622450025000862500010001112600009001215460012001300050017001420STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aGupta, P.P.; Others  aMathematical physics  aFirst  c1970  aEnglish20220125170121.0