There are many problems in mechanics and physics, the mathematical models of which are some boundary value problems for nonlinear elliptic systems of first and second order equations in multiply connected domains including infinity. In this paper, we discuss oblique derivative problems for systems of second order equations.
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Heinrich Begehr, Guochun Wen, Oblique Derivative Problems for Elliptic Systems of Second Order Equations in Infinite Domains. Z. Anal. Anwend. 18 (1999), no. 2, pp. 193–204DOI 10.4171/ZAA/877