TY  - JOUR
AU  - Ying-Qing Wu
TI  - On planarity of graphs in 3-manifolds.
JO  - Commentarii mathematici Helvetici
PY  - 1992
SP  - 635
EP  - 647
VL  - 67
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1992__67_3_140288/
ID  - CMH_1992__67_3_140288
ER  -