$L^p$ estimates for general nonlinear elliptic equations Sun-Sig ByunLihe Wang 35R0535R3535J1535J25conormal derivative problemelliptic equationsBMO spacemaximal functionregularity theory We obtain an optimal $W^{1,p}$, $2 \leq p < \infty$, regularity for the weak solutions of the conormal derivative problem for nonlinear elliptic equations of nonvariational type in Reifenberg domains. Indiana University Mathematics Journal 2007 text pdf 10.1512/iumj.2007.56.3034 10.1512/iumj.2007.56.3034 en Indiana Univ. Math. J. 56 (2007) 3193 - 3222 state-of-the-art mathematics http://iumj.org/access/