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Dr. Hile was supported in part by grant MCS 76-07180 of the National Science Foundation.
Communicated by J. Serrin
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Hile, G.N., Protter, M.H. Properties of overdetermined first order elliptic systems. Arch. Rational Mech. Anal. 66, 267–293 (1977). https://doi.org/10.1007/BF00250674
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