@article{JRAM_1973__258_151287,
     author = {Clifton T. Whyburn},
     title = {Note on a method in elementary number theory.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {153--160},
     publisher = {mathdoc},
     volume = {258},
     year = {1973},
     zbl = {0257.10002},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1973__258_151287/}
}