@article{JRAM_1954__193_150261,
     author = {Gerhard Ringel},
     title = {Farbensatz f\"ur orientierbare {Fl\"achen} vom {Geschlechte} p > 0.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {11--38},
     year = {1954},
     volume = {193},
     zbl = {0058.17501},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1954__193_150261/}
}