@article{JRAM_1989__394_153101,
     author = {R.R. Hall},
     title = {The distribution of squarefree numbers.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {107--117},
     publisher = {mathdoc},
     volume = {394},
     year = {1989},
     zbl = {0653.10040},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1989__394_153101/}
}