%0 Journal Article
%A È. Z. Shuvalova
%T The construction of~an~element of~best approximation to~a~derivative
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1978
%P 207-208
%V 33
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1978_33_5_a20/
%G en
%F RM_1978_33_5_a20