Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1998_34_4_a21, author = {G. Puryushkis}, title = {On the {Dirichlet} problem for nonstrongly elliptic systems}, journal = {Differencialʹnye uravneni\^a}, pages = {570--571}, publisher = {mathdoc}, volume = {34}, number = {4}, year = {1998}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1998_34_4_a21/} }
G. Puryushkis. On the Dirichlet problem for nonstrongly elliptic systems. Differencialʹnye uravneniâ, Tome 34 (1998) no. 4, pp. 570-571. http://geodesic.mathdoc.fr/item/DE_1998_34_4_a21/