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Communicated by J. C. C. Nitsche
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Trudinger, N.S. On the regularity of generalized solutions of linear, non-uniformly elliptic equations. Arch. Rational Mech. Anal. 42, 50–62 (1971). https://doi.org/10.1007/BF00282317
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DOI: https://doi.org/10.1007/BF00282317