@article{MZM_2012_91_5_a2,
     author = {A. V. Babash},
     title = {Automaton {Barriers}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {667--673},
     publisher = {mathdoc},
     volume = {91},
     number = {5},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2012_91_5_a2/}
}