TY  - JOUR
AU  - V. A. Gurvich
TI  - Positional structures and chromatic graphs
JO  - Doklady Akademii Nauk
PY  - 1992
SP  - 828
EP  - 831
VL  - 322
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1992_322_5_a1/
LA  - ru
ID  - DAN_1992_322_5_a1
ER  -