@article{JRAM_1980__317_152254,
     author = {Robert A. Smith},
     title = {The average order of a class of arithmetic functions over arithmetic progressions with applications to quadratic forms.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {74--87},
     publisher = {mathdoc},
     volume = {317},
     year = {1980},
     zbl = {0422.10040},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1980__317_152254/}
}