Geodesic
A maximum principle for linear elliptic systems with discontinuous coefficients
Commentationes Mathematicae Universitatis Carolinae, Tome 45 (2004) no. 3, pp. 457-474.

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We prove a maximum principle for linear second order elliptic systems in divergence form with discontinuous coefficients under a suitable condition on the dispersion of the eigenvalues of the coefficients matrix.
Classification : 35B50, 35B65, 35J55, 35R05
Keywords: maximum principle; elliptic systems 
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Leonardi, S. A maximum principle for linear elliptic systems with discontinuous coefficients. Commentationes Mathematicae Universitatis Carolinae, Tome 45 (2004) no. 3, pp. 457-474. http://geodesic.mathdoc.fr/item/CMUC_2004__45_3_a6/