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Some questions in the qualitative theory of elliptic and parabolic equations. (English. Russian original) Zbl 0122.33701
Translation from Usp. Mat. Nauk 14, No. 1(85), 21–85 (Russian) (1959; Zbl 0095.07703).

MSC:
35J15 Second-order elliptic equations
35K10 Second-order parabolic equations
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