
Functional Spaces for the Theory of Elliptic Partial Differential Equations (Universitext): Demengel, Françoise, Demengel, Gilbert, Erné, Reinie: 9781447128069: Amazon.com: Books,

Distributions, Sobolev Spaces, Elliptic Equations,

Amazon.com: Elements of the Theory of Elliptic Functions (Translations of Mathematical Monographs, 79): 9780821809006: N. I. Akhiezer: Books,

Elliptic Partial Differential Equations of Second Order: Gilbarg, David, Trudinger, Neil S.: 9783540411604: Amazon.com: Books,

Unified Theory for Fractional and Entire Differential Operators
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