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@article{DE_1968_4_1_a1, author = {V. I. Evsin}, title = {Some boundary value problems for {Darboux's} equation}, journal = {Differencialʹnye uravneni\^a}, pages = {16--33}, publisher = {mathdoc}, volume = {4}, number = {1}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1968_4_1_a1/} }
V. I. Evsin. Some boundary value problems for Darboux's equation. Differencialʹnye uravneniâ, Tome 4 (1968) no. 1, pp. 16-33. http://geodesic.mathdoc.fr/item/DE_1968_4_1_a1/