@article{DM_2005_17_3_a6,
     author = {A. V. Babash},
     title = {Periodically externally hereditary permutation automata},
     journal = {Diskretnaya Matematika},
     pages = {68--79},
     publisher = {mathdoc},
     volume = {17},
     number = {3},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2005_17_3_a6/}
}