Geodesic
$(A,\vec0)$-elliptic equations with a weak degeneracy
Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 4, Tome 112 (1981), pp. 75-84 
A. V. Ivanov. $(A,\vec0)$-elliptic equations with a weak degeneracy. Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 4, Tome 112 (1981), pp. 75-84. http://geodesic.mathdoc.fr/item/ZNSL_1981_112_a6/
@article{ZNSL_1981_112_a6,
     author = {A. V. Ivanov},
     title = {$(A,\vec0)$-elliptic equations with a~weak degeneracy},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {75--84},
     year = {1981},
     volume = {112},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_112_a6/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

One establishes existence and uniqueness theorems for the generalized solution of the general boundary-value problem for quasilinear elliptic equations of the second order admitting a weak fixed ellipticity degeneracy. In the case of linear equations one proves the Fredholm solvability of the indicated problem.