Abstract
Necessary and sufficient conditions for validity of the classical maximum modulus principle for solutions of linear strongly elliptic order systems are found.
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Kresin, G.I., Maz'ya, V.G. Criteria for validity of the maximum modulus principle for solutions of linear strongly elliptic second order systems. Potential Anal 2, 73–99 (1993). https://doi.org/10.1007/BF01047674
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DOI: https://doi.org/10.1007/BF01047674