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@article{DE_1969_5_1_a1, author = {A. M. Nakhushev}, title = {Certain boundary value problems for hyperbolic equations and equations of mixed type}, journal = {Differencialʹnye uravneni\^a}, pages = {44--59}, publisher = {mathdoc}, volume = {5}, number = {1}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1969_5_1_a1/} }
A. M. Nakhushev. Certain boundary value problems for hyperbolic equations and equations of mixed type. Differencialʹnye uravneniâ, Tome 5 (1969) no. 1, pp. 44-59. http://geodesic.mathdoc.fr/item/DE_1969_5_1_a1/