Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1973_14_2_a14, author = {V. S. Vinogradov}, title = {Investigation of boundary value problems for elliptic systems of first order}, journal = {Matemati\v{c}eskie zametki}, pages = {291--304}, publisher = {mathdoc}, volume = {14}, number = {2}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1973_14_2_a14/} }
V. S. Vinogradov. Investigation of boundary value problems for elliptic systems of first order. Matematičeskie zametki, Tome 14 (1973) no. 2, pp. 291-304. http://geodesic.mathdoc.fr/item/MZM_1973_14_2_a14/