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@article{MZ_1936__40_168587, author = {G.H. and Littlewood, J.E. Hardy}, title = {An inequality}, journal = {Mathematische Zeitschrift}, pages = {1--40}, publisher = {mathdoc}, volume = {40}, year = {1936}, zbl = {0011.15402}, url = {http://geodesic.mathdoc.fr/item/MZ_1936__40_168587/} }
G.H. and Littlewood, J.E. Hardy. An inequality. Mathematische Zeitschrift, Tome 40 (1936), pp. 1-40. http://geodesic.mathdoc.fr/item/MZ_1936__40_168587/