Brusentsev, A. G.; Rofe-Beketov, F. S. Bedingungen für die Selbstadjungiertheit stark elliptischer Systeme beliebiger Ordnung. (Russian) Zbl 0308.35041 Mat. Sb., N. Ser. 95(137), 108-129 (1974). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page 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) PDF BibTeX XML Cite \textit{A. G. Brusentsev} and \textit{F. S. Rofe-Beketov}, Mat. Sb., Nov. Ser. 95(137), 108--129 (1974; Zbl 0308.35041) OpenURL