%0 Journal Article %A Andrzej Białynicki-Birula %A Joanna Święcicka %T On complete orbit spaces of SL(2) actions %J Colloquium Mathematicum %D 1987 %P 229-243 %V 55 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-55-2-229-243/ %R 10.4064/cm-55-2-229-243 %G en %F 10_4064_cm_55_2_229_243