%0 Journal Article %A S. O. Sinanyan %T Approximation by polynomials in the mean with respect to area %J Sbornik. Mathematics %D 1970 %P 411-421 %V 11 %N 3 %U http://geodesic.mathdoc.fr/item/SM_1970_11_3_a7/ %G en %F SM_1970_11_3_a7