TY  - JOUR
AU  - K. Yu. Gorbunov
TI  - Context-free deducibility of graphs that do not realize a planar
JO  - Doklady Akademii Nauk
PY  - 1991
SP  - 270
EP  - 274
VL  - 316
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1991_316_2_a1/
LA  - ru
ID  - DAN_1991_316_2_a1
ER  -