@article{10_14708_cm_v22i2_6023,
     author = {J. Kwiatkowski},
     title = {Classification of non-ergodic dynamical systems with discrete spectra},
     journal = {Commentationes Mathematicae},
     pages = { 263--274},
     year = {1981},
     volume = {22},
     number = {2},
     doi = {10.14708/cm.v22i2.6023},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v22i2.6023/}
}