@article{AL_2001_40_2_a5,
     author = {A. P. Semigrodskikh},
     title = {Closed {Classes} {Of} {Ultimately} {Periodic} {Functions}},
     journal = {Algebra i logika},
     pages = {202--217},
     year = {2001},
     volume = {40},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2001_40_2_a5/}
}