@article{DAN_1971_196_1_a2,
     author = {Yu. Ya. Breitbart},
     title = {On automaton and {\textquotedblleft}tape{\textquotedblright} complexity of the predicate {\textquotedblleft}to be a $k$-th power of an integer{\textquotedblright}},
     journal = {Doklady Akademii Nauk},
     pages = {16--19},
     year = {1971},
     volume = {196},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_196_1_a2/}
}