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@article{CMH_1992__67_3_140288, author = {Ying-Qing Wu}, title = {On planarity of graphs in 3-manifolds.}, journal = {Commentarii mathematici Helvetici}, pages = {635--647}, publisher = {mathdoc}, volume = {67}, number = {3}, year = {1992}, zbl = {0812.57005}, url = {http://geodesic.mathdoc.fr/item/CMH_1992__67_3_140288/} }
Ying-Qing Wu. On planarity of graphs in 3-manifolds.. Commentarii mathematici Helvetici, Tome 67 (1992) no. 3, pp. 635-647. http://geodesic.mathdoc.fr/item/CMH_1992__67_3_140288/