%0 Journal Article
%A N. N. Pustovoitov
%T The orthoprojection widths of some classes of periodic functions of two variables with a~given majorant of the mixed moduli of continuity
%J Izvestiya. Mathematics 
%D 2000
%P 121-141
%V 64
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_2000_64_1_a3/
%G en
%F IM2_2000_64_1_a3