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@article{MZ_1928__28_168046, author = {G. H., und J. Hardy and J. E. Littlewood}, title = {A convergence criterion for {Fourier} series}, journal = {Mathematische Zeitschrift}, pages = {612--634}, publisher = {mathdoc}, volume = {28}, year = {1928}, zbl = {54.0301.03}, url = {http://geodesic.mathdoc.fr/item/MZ_1928__28_168046/} }
G. H., und J. Hardy; J. E. Littlewood. A convergence criterion for Fourier series. Mathematische Zeitschrift, Tome 28 (1928), pp. 612-634. http://geodesic.mathdoc.fr/item/MZ_1928__28_168046/