Degenerate differential operators of principal type
Doklady Akademii Nauk, Tome 213 (1973) no. 6, pp. 1247-1250.

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     author = {I. A. Kipriyanov},
     title = {Degenerate differential operators of principal type},
     journal = {Doklady Akademii Nauk},
     pages = {1247--1250},
     publisher = {mathdoc},
     volume = {213},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_213_6_a4/}
}
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I. A. Kipriyanov. Degenerate differential operators of principal type. Doklady Akademii Nauk, Tome 213 (1973) no. 6, pp. 1247-1250. http://geodesic.mathdoc.fr/item/DAN_1973_213_6_a4/