@article{DM_1995_7_1_a2,
     author = {D. N. Babin},
     title = {Undecidability of the completeness and {A-completeness} problems for some systems of automaton functions},
     journal = {Diskretnaya Matematika},
     pages = {52--65},
     year = {1995},
     volume = {7},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1995_7_1_a2/}
}