@article{DAN_1982_265_6_a5,
     author = {A. I. Koshelev},
     title = {On precise conditions for smoothness of the solutions of elliptic systems, and {Liouville's} theorem},
     journal = {Doklady Akademii Nauk},
     pages = {1309--1311},
     year = {1982},
     volume = {265},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1982_265_6_a5/}
}