@article{MZ_1922__12_167675,
     author = {Hardy G.H. and J.E. Littlewood},
     title = {Some problems of },
     journal = {Mathematische Zeitschrift},
     pages = {161--188},
     publisher = {mathdoc},
     volume = {12},
     year = {1922},
     zbl = {48.0146.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1922__12_167675/}
}