@article{M2AN_2008__42_6_1047_0,
     author = {Gomes, Diogo A. and Oberman, Adam},
     title = {Viscosity solutions methods for converse {KAM} theory},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {1047--1064},
     publisher = {EDP-Sciences},
     volume = {42},
     number = {6},
     year = {2008},
     doi = {10.1051/m2an:2008035},
     mrnumber = {2473319},
     zbl = {1156.37015},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/m2an:2008035/}
}