Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1982_18_7_a15, author = {N. Yu. Kapustin}, title = {On the theory of boundary value problems for systems of equations of mixed type}, journal = {Differencialʹnye uravneni\^a}, pages = {1207--1213}, publisher = {mathdoc}, volume = {18}, number = {7}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1982_18_7_a15/} }
N. Yu. Kapustin. On the theory of boundary value problems for systems of equations of mixed type. Differencialʹnye uravneniâ, Tome 18 (1982) no. 7, pp. 1207-1213. http://geodesic.mathdoc.fr/item/DE_1982_18_7_a15/