@article{10_14708_wm_v2i2_2747,
     author = {A. Schinzel},
     title = {O okresowo\'sci pewnych ci\k{a}g\'ow liczb naturalnych},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 269--272},
     year = {1959},
     volume = {2},
     number = {2},
     doi = {10.14708/wm.v2i2.2747},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v2i2.2747/}
}