%0 Journal Article %A J. Kwiatkowski %T Classification of non-ergodic dynamical systems with discrete spectra %J Commentationes Mathematicae %D 1981 %P 263-274 %V 22 %N 2 %U http://geodesic.mathdoc.fr/articles/10.14708/cm.v22i2.6023/ %R 10.14708/cm.v22i2.6023 %G pl %F 10_14708_cm_v22i2_6023