%0 Journal Article %A Jan Kwiatkowski %T Factors of ergodic group extensions of rotations %J Studia Mathematica %D 1992 %P 123-131 %V 103 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-103-2-123-131/ %R 10.4064/sm-103-2-123-131 %G en %F 10_4064_sm_103_2_123_131