@article{DAN_1993_329_4_a7,
     author = {M. I. Kratko and A. N. Khruzin},
     title = {Unsolvability of certain problems in the theory of {R\"odding} automata},
     journal = {Doklady Akademii Nauk},
     pages = {416--418},
     publisher = {mathdoc},
     volume = {329},
     number = {4},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_329_4_a7/}
}