@article{SM_2007_198_6_a6,
     author = {A. V. Ustinov},
     title = {Calculation of the variance in a~problem in the theory of continued fractions},
     journal = {Sbornik. Mathematics},
     pages = {887--907},
     year = {2007},
     volume = {198},
     number = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2007_198_6_a6/}
}