A potential estimate type approach is used in order to obtain some a priori bounds for the solutions of certain classes of Dirichlet problems associated with nondivergence structure elliptic equations.
"An Application of Potential Estimates to A Priori Bounds for Elliptic Equations." Abstr. Appl. Anal. 2016 1 - 6, 2016. https://doi.org/10.1155/2016/6463030