%0 Journal Article
%A V. A. Rvachev
%T On approximation by means of the function $\operatorname{up}(x)$
%J Doklady Akademii Nauk
%D 1977
%P 295-296
%V 233
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1977_233_2_a8/
%G ru
%F DAN_1977_233_2_a8