@article{AIHPC_2014__31_1_23_0,
     author = {Cabr\'e, Xavier and Sire, Yannick},
     title = {Nonlinear equations for fractional {Laplacians,} {I:} {Regularity,} maximum principles, and {Hamiltonian} estimates},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {23--53},
     publisher = {Elsevier},
     volume = {31},
     number = {1},
     year = {2014},
     doi = {10.1016/j.anihpc.2013.02.001},
     mrnumber = {3165278},
     zbl = {1286.35248},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/j.anihpc.2013.02.001/}
}