On solvability conditions for equations with double characteristics
Doklady Akademii Nauk, Tome 234 (1977) no. 2, pp. 280-282.

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     author = {Yu. V. Egorov},
     title = {On solvability conditions for equations with double characteristics},
     journal = {Doklady Akademii Nauk},
     pages = {280--282},
     publisher = {mathdoc},
     volume = {234},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_234_2_a4/}
}
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Yu. V. Egorov. On solvability conditions for equations with double characteristics. Doklady Akademii Nauk, Tome 234 (1977) no. 2, pp. 280-282. http://geodesic.mathdoc.fr/item/DAN_1977_234_2_a4/