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Communicated by J. Serrin
This paper was supported in part by the National Science Foundation under Grant GP-7710.
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Piepenbrink, J., Redheffer, R. Nonlinear partial differential inequalities. Arch. Rational Mech. Anal. 36, 89–121 (1970). https://doi.org/10.1007/BF00250811
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DOI: https://doi.org/10.1007/BF00250811