Geodesic
On the smoothness of weak solutions of the Dirichlet problem for quasilinear degenerating second order elliptic equations
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 13, Tome 110 (1981), pp. 30-52 
A. V. Ivanov. On the smoothness of weak solutions of the Dirichlet problem for quasilinear degenerating second order elliptic equations. Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 13, Tome 110 (1981), pp. 30-52. http://geodesic.mathdoc.fr/item/ZNSL_1981_110_a2/
@article{ZNSL_1981_110_a2,
     author = {A. V. Ivanov},
     title = {On the smoothness of weak solutions of the {Dirichlet} problem for quasilinear degenerating second order elliptic equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {30--52},
     year = {1981},
     volume = {110},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_110_a2/}
}
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%D 1981
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