%0 Journal Article %A Van den Ban, E. P. %A Schlichtkrull, H. %T Convexity for invariant differential operators on semisimple symmetric spaces %J Compositio Mathematica %D 1993 %P 301-313 %V 89 %N 3 %I Kluwer Academic Publishers %U http://archive.numdam.org/item/CM_1993__89_3_301_0/ %G en %F CM_1993__89_3_301_0