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Communicated by J. Serrin
Research supported in part by a grant from the National Science Foundation.
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Gariepy, R., Ziemer, W.P. Behavior at the boundary of solutions of quasilinear elliptic equations. Arch. Rational Mech. Anal. 56, 372–384 (1974). https://doi.org/10.1007/BF00248149
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DOI: https://doi.org/10.1007/BF00248149