@article{MZ_1931__33_168286,
     author = {S. D., Chowla},
     title = {Some problems of diophantine approximation {(I)}},
     journal = {Mathematische Zeitschrift},
     pages = {544--563},
     year = {1931},
     volume = {33},
     zbl = {0001.32501},
     url = {http://geodesic.mathdoc.fr/item/MZ_1931__33_168286/}
}