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Elliptic systems in the plane with first order terms and constant coefficients. (English) Zbl 0393.35011

##### MSC:
 35E99 Partial differential equations and systems of partial differential equations with constant coefficients 35J45 Systems of elliptic equations, general (MSC2000) 30G20 Generalizations of Bers and Vekua type (pseudoanalytic, $$p$$-analytic, etc.) 30G30 Other generalizations of analytic functions (including abstract-valued functions)
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##### References:
 [1] Bers L., N. Y. U. Lecture Notes (1953) [2] Douglis A., Comm. Pure Appl. Math VI pp 259– (1953) · Zbl 0050.31901 [3] Douglis A., Non-parabolic systems of linear differential equations in two independent variables (dittoed report (1950) [4] Gilbert R. P., Springer Lecture Notes 365 (1974) [5] Gilbert R. P., Trans. Amer. Math. SOC. 195 pp 1– (1974) [6] Gilbert R. P., Math. Nachr. 76 pp 187– (1976) · Zbl 0341.30032 [7] Hile G. N., J. Differential Equations 25 pp 410– (1977) · Zbl 0371.35005 [8] Isaacson E., Analysis of Numerical Methods (1966) · Zbl 0168.13101 [9] Vekua I. N., Generalized Analytic Functions (1962) · Zbl 0127.03505
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