%0 Journal Article %A M. Kankaanrinta %T Lifting Smooth Homotopies of Orbit Spaces of Proper Lie Group Actions %J Journal of Lie Theory %D 2005 %P 447-456 %V 15 %N 2 %U http://geodesic.mathdoc.fr/item/JOLT_2005_15_2_a5/ %F JOLT_2005_15_2_a5