Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1976_12_5_a17, author = {A. G. Ramm}, title = {A boundary value problem with a discontinuous boundary condition}, journal = {Differencialʹnye uravneni\^a}, pages = {931--933}, publisher = {mathdoc}, volume = {12}, number = {5}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1976_12_5_a17/} }
A. G. Ramm. A boundary value problem with a discontinuous boundary condition. Differencialʹnye uravneniâ, Tome 12 (1976) no. 5, pp. 931-933. http://geodesic.mathdoc.fr/item/DE_1976_12_5_a17/