@article{JRAM_1978__298_151961,
     author = {Helmut Hasse and Gordon Prichett},
     title = {A conjecture on digital cycles.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {8--15},
     year = {1978},
     volume = {298},
     zbl = {0365.10006},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1978__298_151961/}
}