%0 Journal Article %A Sergei Merkulov %A Lorenz Schwachhöfer %T Classification of irreducible holonomies of torsion-free affine connections %J Annals of mathematics %D 1999 %V 150 %N 1 %U http://geodesic.mathdoc.fr/articles/10.2307/121098/ %R 10.2307/121098 %F 10_2307_121098