Amanov R. A.
Ukr. Mat. Zh. - 2008. - 60, № 7. - pp. 918–936
For the quasilinear equations div A(x, u, ∇u) = 0 with degeneracy ω(x) from the Muckenhaupt Ap -class, we prove the Harnack inequality, an estimate of the Holder norm, and a sufficient test for the regularity of boundary points of the Wiener type.