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Uniformly nonelliptic problems. I, II. (English. Russian original) Zbl 0179.43304
Math. USSR, Sb. 1(1967), 543-568 (1968); 2(1967), 111-133 (1968); translation from Mat. Sb., n. Ser. 72(114), 602-636 (1967); 73(115), 126-154 (1967).

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