@article{DAN_1963_151_3_a4,
     author = {V. B. Kudryavtsev},
     title = {The powers of sets of precomplete classes of certain functionals of systems related to automata},
     journal = {Doklady Akademii Nauk},
     pages = {493--496},
     publisher = {mathdoc},
     volume = {151},
     number = {3},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_151_3_a4/}
}