@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/}
}