TY  - JOUR
AU  - D. V. Karpov
TI  - Upper bound on  the number of edges of an almost planar bipartite graph
JO  - Zapiski Nauchnykh Seminarov POMI
PY  - 2012
SP  - 12
EP  - 30
VL  - 406
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ZNSL_2012_406_a1/
LA  - ru
ID  - ZNSL_2012_406_a1
ER  -