On the smoothness of weak solutions of strong-nonlinear nondiagonal elliptic systems (the two-dimensional case)
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 36, Tome 318 (2004), pp. 5-13

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We consider a class of strong-nonlinear elliptic systems with a nondiagonal principal matrix. Weak solvability of the Dirichlet problem for such type systems was earlier proved by the author in the two-dimensional case. The solution constructed was smooth almost everywhere. Here we prove that this solution is a Hölder continuous function in the entire domain.
@article{ZNSL_2004_318_a0,
     author = {A. A. Arkhipova},
     title = {On the smoothness of weak solutions of strong-nonlinear nondiagonal elliptic systems (the two-dimensional case)},
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A. A. Arkhipova. On the smoothness of weak solutions of strong-nonlinear nondiagonal elliptic systems (the two-dimensional case). Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 36, Tome 318 (2004), pp. 5-13. http://geodesic.mathdoc.fr/item/ZNSL_2004_318_a0/