00269nam a2200121Ia 45000030006000000080041000060400015000471000016000622450025000782600015001035460012001180050017001300STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aGupta, B.D.  aMathematical physics  bVanic1986  aEnglish20220125170125.0