%0 Journal Article %A V. N. Trofimov %T Linear methods of approximation to continuous periodic functions of two variables %J Doklady Akademii Nauk %D 1961 %P 531-532 %V 137 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1961_137_3_a10/ %G ru %F DAN_1961_137_3_a10