00287nam a2200121Ia 45000030006000000080041000060400015000471000022000622450043000842600009001275460012001360050017001480STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aDavis Harr, I.F.d  aFourier series and orthgonal functions  c1963  aEnglish20220125165959.0