%0 Journal Article %A Uwe Schauz %T Some new characterizations of graph colorability and of blocking sets of projective spaces %J The electronic journal of combinatorics %D 2014 %V 21 %N 2 %U http://geodesic.mathdoc.fr/articles/10.37236/3767/ %R 10.37236/3767 %F 10_37236_3767