@article{PORMA_1977__36_2_115310,
     author = {Faber, Vance},
     title = {An upper bound for the minimum valency of a graph embedded in a compact 2-manifold},
     journal = {Portugaliae mathematica},
     pages = {139--152},
     publisher = {mathdoc},
     volume = {36},
     number = {2},
     year = {1977},
     mrnumber = {0577418},
     zbl = {0433.05027},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1977__36_2_115310/}
}