Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1980_252_6_a6, author = {J. Ne\v{c}as and O. A. Oleinik}, title = {Liouville theorems for elliptic systems}, journal = {Doklady Akademii Nauk}, pages = {1312--1316}, publisher = {mathdoc}, volume = {252}, number = {6}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1980_252_6_a6/} }
J. Nečas; O. A. Oleinik. Liouville theorems for elliptic systems. Doklady Akademii Nauk, Tome 252 (1980) no. 6, pp. 1312-1316. http://geodesic.mathdoc.fr/item/DAN_1980_252_6_a6/