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Bedingungen für die Selbstadjungiertheit stark elliptischer Systeme beliebiger Ordnung. (Russian) Zbl 0308.35041

MSC:

35J45 Systems of elliptic equations, general (MSC2000)
35B25 Singular perturbations in context of PDEs
35R20 Operator partial differential equations (= PDEs on finite-dimensional spaces for abstract space valued functions)
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