%0 Journal Article %A Noga Alon %A Miklós Ruszinkó %T Short certificates for tournaments %J The electronic journal of combinatorics %D 1997 %V 4 %N 1 %U http://geodesic.mathdoc.fr/articles/10.37236/1297/ %R 10.37236/1297 %F 10_37236_1297