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This paper was written while the author was a visiting professor at Utah State University in Logan/Utah. The support of this institution is gratefully acknowledged.
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Walter, W. A theorem on elliptic differential inequalities with an application to gradient bounds. Math Z 200, 293–299 (1989). https://doi.org/10.1007/BF01230289
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DOI: https://doi.org/10.1007/BF01230289