@article{JRAM_1893__112_148893,
     author = {K.Th. Vahlen},
     title = {Beitr\"age zu einer additiven {Zahlentheorie.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--36},
     publisher = {mathdoc},
     volume = {112},
     year = {1893},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1893__112_148893/}
}