%0 Journal Article %A John Harvey %A Martin Kerin %A Krishnan Shankar %T Semi-Free Actions with Manifold Orbit Spaces %J Documenta mathematica %D 2020 %P 2085-2114 %V 25 %U http://geodesic.mathdoc.fr/articles/10.4171/dm/794/ %R 10.4171/dm/794 %F 10_4171_dm_794