@article{JRAM_1984__355_152693,
     author = {M. Jutila},
     title = {On exponential sums involving the divisor function.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {173--190},
     year = {1984},
     volume = {355},
     zbl = {0542.10032},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1984__355_152693/}
}