Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1975_11_1_a4, author = {V. P. Didenko}, title = {Boundary value problems for a three-dimensional equation of mixed type}, journal = {Differencialʹnye uravneni\^a}, pages = {33--37}, publisher = {mathdoc}, volume = {11}, number = {1}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1975_11_1_a4/} }
V. P. Didenko. Boundary value problems for a three-dimensional equation of mixed type. Differencialʹnye uravneniâ, Tome 11 (1975) no. 1, pp. 33-37. http://geodesic.mathdoc.fr/item/DE_1975_11_1_a4/