MathSciNet bibliographic data MR740185 35J55 Selvaggi, R.; Sisto, I. A boundary value problem for symmetric elliptic systems of first order semilinear partial differential equations in open sets of class \$C\sp{1}\$$C\sp{1}$. Proc. Amer. Math. Soc. 91 (1984), no. 2, 275–280. Article

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