Geodesic
Regularity of weak solutions of degenerate eliptic equations
Acta mathematica Universitatis Comenianae, Tome 77 (2008) no. 1 
A. C. Cavalheiro. Regularity of weak solutions of degenerate eliptic equations. Acta mathematica Universitatis Comenianae, Tome 77 (2008) no. 1. http://geodesic.mathdoc.fr/item/AMUC_2008_77_1_a4/
@article{AMUC_2008_77_1_a4,
     author = {A. C. Cavalheiro},
     title = {Regularity of weak solutions of degenerate eliptic equations},
     journal = {Acta mathematica Universitatis Comenianae},
     year = {2008},
     volume = {77},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/AMUC_2008_77_1_a4/}
}
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Voir la notice de l'article provenant de la source Comenius University

In this article we establish the existence of higher order weak derivatives of weak solutions of the Dirichlet problem for a class of degenerate elliptic equations.