@article{DM_1992_4_4_a4,
     author = {D. N. Babin},
     title = {A~decidable case of a~problem on the completeness of automaton functions},
     journal = {Diskretnaya Matematika},
     pages = {41--55},
     year = {1992},
     volume = {4},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1992_4_4_a4/}
}