TY  - JOUR
AU  - V. A. Rvachev
TI  - On approximation by means of the function $\operatorname{up}(x)$
JO  - Doklady Akademii Nauk
PY  - 1977
SP  - 295
EP  - 296
VL  - 233
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1977_233_2_a8/
LA  - ru
ID  - DAN_1977_233_2_a8
ER  -