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@article{MZ_1921__9_167608, author = {G.H., and J.E. Littlewood Hardy}, title = {Some {Problems} of}, journal = {Mathematische Zeitschrift}, pages = {14--27}, publisher = {mathdoc}, volume = {9}, year = {1921}, zbl = {48.0142.01}, url = {http://geodesic.mathdoc.fr/item/MZ_1921__9_167608/} }
G.H., and J.E. Littlewood Hardy. Some Problems of. Mathematische Zeitschrift, Tome 9 (1921), pp. 14-27. http://geodesic.mathdoc.fr/item/MZ_1921__9_167608/