A “quasi maximum principle” for I-surfaces
Annales de l'I.H.P. Analyse non linéaire, Tome 24 (2007) no. 4, pp. 549-561. 
@article{AIHPC_2007__24_4_549_0,
     author = {Jakob, Ruben},
     title = {A {\textquotedblleft}quasi maximum principle{\textquotedblright} for $I$-surfaces},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {549--561},
     publisher = {Elsevier},
     volume = {24},
     number = {4},
     year = {2007},
     doi = {10.1016/j.anihpc.2006.03.006},
     zbl = {1120.49038},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.anihpc.2006.03.006/}
}
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Jakob, Ruben. A “quasi maximum principle” for $I$-surfaces. Annales de l'I.H.P. Analyse non linéaire, Tome 24 (2007) no. 4, pp. 549-561. doi : 10.1016/j.anihpc.2006.03.006. http://www.numdam.org/articles/10.1016/j.anihpc.2006.03.006/

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