@article{DAN_1970_193_5_a11,
     author = {S. A. Rusakov},
     title = {A generalization of {Post's} theorem},
     journal = {Doklady Akademii Nauk},
     pages = {1008--1011},
     publisher = {mathdoc},
     volume = {193},
     number = {5},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_193_5_a11/}
}