Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1980_16_3_a14, author = {\`E. M. Saak}, title = {Fredholm property of a class of boundary value problems}, journal = {Differencialʹnye uravneni\^a}, pages = {507--515}, publisher = {mathdoc}, volume = {16}, number = {3}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1980_16_3_a14/} }
È. M. Saak. Fredholm property of a class of boundary value problems. Differencialʹnye uravneniâ, Tome 16 (1980) no. 3, pp. 507-515. http://geodesic.mathdoc.fr/item/DE_1980_16_3_a14/