@article{DAN_1976_227_3_a14,
     author = {A. A. Ruban},
     title = {The entropy of a transformation connected with {Perron's} algorithm for $p$-adic numbers},
     journal = {Doklady Akademii Nauk},
     pages = {571--573},
     publisher = {mathdoc},
     volume = {227},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_227_3_a14/}
}