%0 Journal Article %A J. Winkelmann %T A Splitting Criterion for Two-Dimensional Semi-Tori %J Journal of Lie Theory %D 2004 %P 555-561 %V 14 %N 2 %U http://geodesic.mathdoc.fr/item/JOLT_2004_14_2_a12/ %F JOLT_2004_14_2_a12