00263nam a2200121Ia 45000030006000000080041000060400015000471000019000622450022000812600009001035460012001120050017001240STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aAsh Robert, B.  aComplex variables  c1971  aEnglish20220125170004.0