TY - JOUR AU - A. B. Kupavskii AU - A. M. Raigorodskii TI - Obstructions to the realization of distance graphs with large chromatic numbers on spheres of small radii JO - Sbornik. Mathematics PY - 2013 SP - 1435 EP - 1479 VL - 204 IS - 10 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_2013_204_10_a1/ LA - en ID - SM_2013_204_10_a1 ER -