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This work was supported by the Office of Naval Research. It was completed in part while ihe author was at Stanford University ih the summer of 1955.
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Serrin, J. On the Harnack inequality for linear elliptic equations. J. Anal. Math. 4, 292–308 (1954). https://doi.org/10.1007/BF02787725
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DOI: https://doi.org/10.1007/BF02787725