@article{AIHPC_2016__33_3_767_0,
     author = {Caffarelli, Luis A. and Stinga, Pablo Ra\'ul},
     title = {Fractional elliptic equations, {Caccioppoli} estimates and regularity},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {767--807},
     publisher = {Elsevier},
     volume = {33},
     number = {3},
     year = {2016},
     doi = {10.1016/j.anihpc.2015.01.004},
     zbl = {1381.35211},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.anihpc.2015.01.004/}
}