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@article {MR2226916, 
   author = {Gripenberg, Gustaf},
    title = {Generalized viscosity solutions of elliptic {PDE}s and boundary conditions},
     year = {2006},
  journal = {Electron. J. Differential Equations},
    pages = {No. 43, 10 pp. (electronic)},
     issn = {1072-6691},
  mrclass = {35J60 (35D05)},
 mrnumber = {MR2226916 (2006m:35097)},
 fjournal = {Electronic Journal of Differential Equations}
}