@article{DAN_1983_272_2_a9,
     author = {A. I. Koshelev and S. I. Chelkak},
     title = {Regularity of solutions of elliptic systems of higher orders},
     journal = {Doklady Akademii Nauk},
     pages = {297--300},
     publisher = {mathdoc},
     volume = {272},
     number = {2},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_272_2_a9/}
}