@article{DM_1990_2_4_a3,
     author = {S. B. Gashkov},
     title = {The complexity of the approximate calculation of real numbers by means of schemes and formulas in various rational bases},
     journal = {Diskretnaya Matematika},
     pages = {259--283},
     publisher = {mathdoc},
     volume = {2},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1990_2_4_a3/}
}