@article{AIHPC_2019__36_1_165_0,
     author = {Caffarelli, Luis and D\'avila, Gonzalo},
     title = {Interior regularity for fractional systems},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {165--180},
     publisher = {Elsevier},
     volume = {36},
     number = {1},
     year = {2019},
     doi = {10.1016/j.anihpc.2018.04.004},
     mrnumber = {3906869},
     zbl = {1411.35111},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/j.anihpc.2018.04.004/}
}