%0 Journal Article %A Mika Seppälä %A Tuomas Sorvali %T Parametrization of Möbius groups acting in a disk. %J Commentarii mathematici Helvetici %D 1986 %P 149-160 %V 61 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMH_1986__61_140045/ %F CMH_1986__61_140045