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Approximation of Steklov eigenvalues of non-selfadjoint second order elliptic operators. (English) Zbl 0264.35055
Math. Found. finite Elem. Method Appl. part. differ. Equations, Sympos. Univ. Maryland, Baltimore 1972, 387-408 (1972).

35P15 Estimates of eigenvalues in context of PDEs
35P99 Spectral theory and eigenvalue problems for partial differential equations
35P05 General topics in linear spectral theory for PDEs