Geodesic
On the theory of boundary value problems for mixed type equations in multidimensional domains. I
Differencialʹnye uravneniâ, Tome 13 (1977) no. 1, pp. 64-75 
G. D. Karatoprakliev. On the theory of boundary value problems for mixed type equations in multidimensional domains. I. Differencialʹnye uravneniâ, Tome 13 (1977) no. 1, pp. 64-75. http://geodesic.mathdoc.fr/item/DE_1977_13_1_a9/
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     author = {G. D. Karatoprakliev},
     title = {On the theory of boundary value problems for mixed type equations in multidimensional domains. {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {64--75},
     year = {1977},
     volume = {13},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_1_a9/}
}
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