%0 Journal Article %A Philip Foth %A Michael Otto %T A symplectic approach to van den Ban's convexity theorem %J Documenta mathematica %D 2006 %P 407-424 %V 11 %U http://geodesic.mathdoc.fr/articles/10.4171/dm/216/ %R 10.4171/dm/216 %F 10_4171_dm_216