@article{RM_2009_64_5_a1,
     author = {An. A. Muchnik and Yu. L. Pritykin and A. L. Semenov},
     title = {Sequences close to periodic},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {805--871},
     publisher = {mathdoc},
     volume = {64},
     number = {5},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2009_64_5_a1/}
}