@article{AIHPC_2008__25_3_567_0,
     author = {Barles, Guy and Imbert, Cyril},
     title = {Second-order elliptic integro-differential equations : viscosity solutions' theory revisited},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {567--585},
     publisher = {Elsevier},
     volume = {25},
     number = {3},
     year = {2008},
     doi = {10.1016/j.anihpc.2007.02.007},
     mrnumber = {2422079},
     zbl = {1155.45004},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/j.anihpc.2007.02.007/}
}