00270nam a2200121Ia 45000030006000000080041000060400015000471000016000622450025000782600016001035460012001190050017001310STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aGupta, B.D.  aMathematical physics  bVikasc1988  aEnglish20220125170126.0