@article{JRAM_1933__169_149853,
     author = {H. Davenport},
     title = {On certain exponential sums.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {158--176},
     publisher = {mathdoc},
     volume = {169},
     year = {1933},
     zbl = {59.0370.03},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1933__169_149853/}
}