%0 Journal Article %A Joseph, A. %T Towards the Jantzen conjecture %J Compositio Mathematica %D 1980 %P 35-67 %V 40 %N 1 %I Sijthoff et Noordhoff International Publishers %U http://www.numdam.org/item/CM_1980__40_1_35_0/ %G en %F CM_1980__40_1_35_0