@article{10_14708_cm_v21i1_5970,
     author = {K. Krzy\.zewski},
     title = {A remark on the ergodic theorem},
     journal = {Commentationes Mathematicae},
     pages = { 137--140},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1980},
     doi = {10.14708/cm.v21i1.5970},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v21i1.5970/}
}