@article{SM_2017_208_5_a2,
     author = {V. A. Bykovskii and D. A. Frolenkov},
     title = {The average length of finite continued fractions with fixed denominator},
     journal = {Sbornik. Mathematics},
     pages = {644--683},
     publisher = {mathdoc},
     volume = {208},
     number = {5},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2017_208_5_a2/}
}