%0 Journal Article %A André, Yves %T Mumford-Tate groups of mixed Hodge structures and the theorem of the fixed part %J Compositio Mathematica %D 1992 %P 1-24 %V 82 %N 1 %I Kluwer Academic Publishers %U http://www.numdam.org/item/CM_1992__82_1_1_0/ %G en %F CM_1992__82_1_1_0