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@article{DE_1976_12_1_a16, author = {M. M. Khachev}, title = {The {Dirichlet} problem for a certain equation of mixed type}, journal = {Differencialʹnye uravneni\^a}, pages = {137--143}, publisher = {mathdoc}, volume = {12}, number = {1}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1976_12_1_a16/} }
M. M. Khachev. The Dirichlet problem for a certain equation of mixed type. Differencialʹnye uravneniâ, Tome 12 (1976) no. 1, pp. 137-143. http://geodesic.mathdoc.fr/item/DE_1976_12_1_a16/