%0 Journal Article %A Kottwitz, Robert E. %T Isocrystals with additional structure %J Compositio Mathematica %D 1985 %P 201-220 %V 56 %N 2 %I Martinus Nijhoff Publishers %U http://www.numdam.org/item/CM_1985__56_2_201_0/ %G en %F CM_1985__56_2_201_0