Geodesic
Maximum principles for second order equations of mixed elliptic-hyperbolic type
Doklady Akademii Nauk, Tome 185 (1969) no. 5, pp. 991-994.

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@article{DAN_1969_185_5_a5,
     author = {M. E. Lerner},
     title = {Maximum principles for second order equations of mixed elliptic-hyperbolic type},
     journal = {Doklady Akademii Nauk},
     pages = {991--994},
     publisher = {mathdoc},
     volume = {185},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_185_5_a5/}
}
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M. E. Lerner. Maximum principles for second order equations of mixed elliptic-hyperbolic type. Doklady Akademii Nauk, Tome 185 (1969) no. 5, pp. 991-994. http://geodesic.mathdoc.fr/item/DAN_1969_185_5_a5/