Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1997_354_1_a5, author = {I. Ya. Roitberg}, title = {Elliptic boundary value problems for general systems of equations}, journal = {Doklady Akademii Nauk}, pages = {25--29}, publisher = {mathdoc}, volume = {354}, number = {1}, year = {1997}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1997_354_1_a5/} }
I. Ya. Roitberg. Elliptic boundary value problems for general systems of equations. Doklady Akademii Nauk, Tome 354 (1997) no. 1, pp. 25-29. http://geodesic.mathdoc.fr/item/DAN_1997_354_1_a5/