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Sistemi ellittici in forma divergenza. Regolarita all’interno. (English) Zbl 0453.35026
Pubblicazioni della Classe di Scienze: Quaderni. Pisa: Scuola Normale Superiore. 188 p. (1980).

35J45 Systems of elliptic equations, general (MSC2000)
35A05 General existence and uniqueness theorems (PDE) (MSC2000)
35B65 Smoothness and regularity of solutions to PDEs
46E35 Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems