@article{VMUMM_1994_4_a3,
     author = {P. L. Ivankov},
     title = {On the approximation of values of some functions},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {12--15},
     publisher = {mathdoc},
     number = {4},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1994_4_a3/}
}