Geodesic
On an approach to the study of qualitative properties of solutions of nondivergence elliptic equations of second order
Sbornik. Mathematics, Tome 50 (1985) no. 2, pp. 343-367

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The author studies some important interior and boundary properties of solutions of linear and quasilinear second order elliptic equations, which may in general be degenerate on the boundary of a (bounded or unbounded) domain. An a priori estimate of the Hölder norm of the solution is obtained, and new theorems are proved on regularity of a boundary point with respect to the Dirichlet problem. The Harnack inequality and Phragmén–Lindelöf type theorems are also proved. Bibliography: 37 titles. 
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     author = {A. A. Novruzov},
     title = {On an approach to the study of qualitative properties of solutions of nondivergence elliptic equations of second order},
     journal = {Sbornik. Mathematics},
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A. A. Novruzov. On an approach to the study of qualitative properties of solutions of nondivergence elliptic equations of second order. Sbornik. Mathematics, Tome 50 (1985) no. 2, pp. 343-367. http://geodesic.mathdoc.fr/item/SM_1985_50_2_a3/