%0 Journal Article
%A O. A. Timoshin
%T Best approximation of the operator of second mixed derivative in the metrics of $L$ and $C$ on the plane
%J Matematičeskie zametki
%D 1984
%P 369-375
%V 36
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1984_36_3_a9/
%G ru
%F MZM_1984_36_3_a9