Geodesic
Uniformly nonelliptic problems. I
Sbornik. Mathematics, Tome 1 (1967) no. 4, pp. 543-568 
B. R. Vainberg; V. V. Grushin. Uniformly nonelliptic problems. I. Sbornik. Mathematics, Tome 1 (1967) no. 4, pp. 543-568. http://geodesic.mathdoc.fr/item/SM_1967_1_4_a4/
@article{SM_1967_1_4_a4,
     author = {B. R. Vainberg and V. V. Grushin},
     title = {Uniformly nonelliptic problems. {I}},
     journal = {Sbornik. Mathematics},
     pages = {543--568},
     year = {1967},
     volume = {1},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1967_1_4_a4/}
}
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IS  - 4
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