00331nam a2200121Ia 4500082001900000100001900019245006700038260003400105300002000139490004000159500000500199700000500204  a515.1bOk41.AS  aOkuyama, Yasuo  aAbsolute summability of fourier series and orthogonal seriesb  aBerlinbSpringer-Verlagc1984  avi, 117p. Index  aLecture notes in Mathematicsv 1067  a  a