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@article{MZ_1932__34_168332, author = {J. E., and G. H. Hardy, Littlewood}, title = {An additional note on {Parseval's} {Theorem}}, journal = {Mathematische Zeitschrift}, pages = {634--636}, publisher = {mathdoc}, volume = {34}, year = {1932}, zbl = {0003.20303}, url = {http://geodesic.mathdoc.fr/item/MZ_1932__34_168332/} }
J. E., and G. H. Hardy, Littlewood. An additional note on Parseval's Theorem. Mathematische Zeitschrift, Tome 34 (1932), pp. 634-636. http://geodesic.mathdoc.fr/item/MZ_1932__34_168332/