TY  - JOUR
AU  - Babson, Eric
AU  - Kozlov, Dmitry
TI  - Topological obstructions to graph colorings
JO  - Electronic research announcements of the American Mathematical Society
PY  - 2003
SP  - 61
EP  - 68
VL  - 09
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.1090/S1079-6762-03-00112-4/
DO  - 10.1090/S1079-6762-03-00112-4
ID  - ERAAMS_2003_09_a7
ER  -