no. 5
Regularity for degenerate elliptic problems via p-harmonic approximation
Annales de l'I.H.P. Analyse non linéaire, Tome 21 (2004) no. 5, pp. 735-766. 
@article{AIHPC_2004__21_5_735_0,
     author = {Duzaar, Frank and Mingione, Giuseppe},
     title = {Regularity for degenerate elliptic problems via $p$-harmonic approximation},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {735--766},
     publisher = {Elsevier},
     volume = {21},
     number = {5},
     year = {2004},
     doi = {10.1016/j.anihpc.2003.09.003},
     zbl = {02116187},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.anihpc.2003.09.003/}
}
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Duzaar, Frank; Mingione, Giuseppe. Regularity for degenerate elliptic problems via $p$-harmonic approximation. Annales de l'I.H.P. Analyse non linéaire, Tome 21 (2004) no. 5, pp. 735-766. doi : 10.1016/j.anihpc.2003.09.003. http://www.numdam.org/articles/10.1016/j.anihpc.2003.09.003/

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