@article{GDZPPN002068559, title = {On planarity of graphs in 3-manifolds.}, journal = {Commentarii mathematici Helvetici}, volume = {67}, year = {1992}, pages = {635-647}, zbl = {0812.57005}, url = {http://dml.mathdoc.fr/item/GDZPPN002068559} }
Wu, Ying-Qing. On planarity of graphs in 3-manifolds.. Commentarii mathematici Helvetici, Tome 67 (1992) pp. 635-647. http://gdmltest.u-ga.fr/item/GDZPPN002068559/