Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1995_31_1_a9, author = {V. E. Balabaev}, title = {First-order normal elliptic systems}, journal = {Differencialʹnye uravneni\^a}, pages = {71--83}, publisher = {mathdoc}, volume = {31}, number = {1}, year = {1995}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1995_31_1_a9/} }
V. E. Balabaev. First-order normal elliptic systems. Differencialʹnye uravneniâ, Tome 31 (1995) no. 1, pp. 71-83. http://geodesic.mathdoc.fr/item/DE_1995_31_1_a9/