Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1991_27_12_a8, author = {V. E. Balabaev}, title = {First-order canonical elliptic systems}, journal = {Differencialʹnye uravneni\^a}, pages = {2082--2094}, publisher = {mathdoc}, volume = {27}, number = {12}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1991_27_12_a8/} }
V. E. Balabaev. First-order canonical elliptic systems. Differencialʹnye uravneniâ, Tome 27 (1991) no. 12, pp. 2082-2094. http://geodesic.mathdoc.fr/item/DE_1991_27_12_a8/