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Communicated by R. Finn
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Nečas, J. On the regularity of solutions of second-order elliptic partial differential equations with an unbounded Dirichlet integral. Arch. Rational Mech. Anal. 9, 134–144 (1962). https://doi.org/10.1007/BF00253340
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DOI: https://doi.org/10.1007/BF00253340