%0 Journal Article %A A. I. Koshelev %A S. I. Chelkak %T Regularity of solutions of elliptic systems of higher orders %J Doklady Akademii Nauk %D 1983 %P 297-300 %V 272 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1983_272_2_a9/ %G ru %F DAN_1983_272_2_a9