In this paper a method for proving homogenization of divergence form elliptic equations is extended to the non-divergence case. A new proof of homogenization is given when the coefficients in the equation are assumed to be stationary and ergodic. A rate of convergence theorem in homogenization is also obtained, under the assumption that the coefficients are i.i.d. and the elliptic equation can be solved by a convergent perturbation series.
"On Homogenization of Non-Divergence Form Partial Difference Equations." Electron. Commun. Probab. 10 125 - 135, 2005. https://doi.org/10.1214/ECP.v10-1141