MathSciNet bibliographic data MR2918276 47G30 (46E35) Savin, A. Yu. On the symbol of nonlocal operators in Sobolev spaces. (Russian) Differ. Uravn. 47 (2011), no. 6, 890--893; translation in Differ. Equ. 47 (2011), no. 6, 897–900 Article

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