@article{SM_2019_210_3_a2,
     author = {I. D. Kan},
     title = {Is {Zaremba's} conjecture true?},
     journal = {Sbornik. Mathematics},
     pages = {364--416},
     year = {2019},
     volume = {210},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2019_210_3_a2/}
}