TY  - JOUR
AU  - Freedman, Michael
AU  - Lovász, László
AU  - Schrijver, Alexander
TI  - Reflection positivity, rank connectivity, and homomorphism of graphs
JO  - Journal of the American Mathematical Society
PY  - 2007
SP  - 37
EP  - 51
VL  - 20
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-06-00529-7/
DO  - 10.1090/S0894-0347-06-00529-7
ID  - 10_1090_S0894_0347_06_00529_7
ER  -