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The second author was supported in part by National Science Foundation grant MCS78-01993 and by a fellowship from the Humboldt Foundation of West Germany, while visiting at the Free University of Berlin in 1979
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Begehr, H., Hile, G.N. Nonlinear Riemann boundary value problems for a nonliear elliptic system in the plane. Math Z 179, 241–261 (1982). https://doi.org/10.1007/BF01214316
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DOI: https://doi.org/10.1007/BF01214316