00318nam a2200145Ia 45000030006000000080041000060400015000471000027000622450029000892500010001182600009001283000006001375460012001430050017001550STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aBerberian Sterling, K.  aNotes on spectral theory  aFirst  c1966  a0  aEnglish20220125165954.0