TY - DATA AU - Y. Okuyama TI - Absolute Summability of Fourier Series and Orthogonal Series T2 - Lecture Notes in Mathematics SN - 9783540389026 PY - 1984/// CY - Heidelberg PB - Springer Berlin KW - Mathematics and Statistics UR - https://doi.org/10.1007/BFb0099712 ER -