@article{10_4153_CJM_1979_091_3,
     author = {Tutte, W. T.},
     title = {Combinatorial {Oriented} {Maps}},
     journal = {Canadian journal of mathematics},
     pages = {986--1004},
     year = {1979},
     volume = {31},
     number = {5},
     doi = {10.4153/CJM-1979-091-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1979-091-3/}
}