MathSciNet bibliographic data MR1486629 (99c:35053) 35J60 (35B27) Caffarelli, L. A.; Peral, I. On \$W\sp {1,p}\$$W\sp {1,p}$ estimates for elliptic equations in divergence form. Comm. Pure Appl. Math. 51 (1998), no. 1, 1–21. Article

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