Geodesic
Characteristic problems with a principal part that contains mixed derivatives
Differencialʹnye uravneniâ, Tome 12 (1976) no. 2, pp. 309-324.

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     author = {A. A. Iosif'yan},
     title = {Characteristic problems with a principal part that contains mixed derivatives},
     journal = {Differencialʹnye uravneni\^a},
     pages = {309--324},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_2_a14/}
}
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A. A. Iosif'yan. Characteristic problems with a principal part that contains mixed derivatives. Differencialʹnye uravneniâ, Tome 12 (1976) no. 2, pp. 309-324. http://geodesic.mathdoc.fr/item/DE_1976_12_2_a14/