@article{JRAM_1965__220_150703,
     author = {Gerhard Ringel},
     title = {Der vollst\"andige paare {Graph} auf nichtorientierbaren {Fl\"achen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {88--93},
     publisher = {mathdoc},
     volume = {220},
     year = {1965},
     zbl = {0132.21204},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1965__220_150703/}
}