%0 Journal Article %A R. P. Anstee %A S. N. Karp %T Forbidden configurations: exact bounds determined by critical substructures %J The electronic journal of combinatorics %D 2010 %V 17 %U http://geodesic.mathdoc.fr/articles/10.37236/322/ %R 10.37236/322 %F 10_37236_322