@article{JEMS_2017_19_4_a0,
     author = {Serena Dipierro and Ovidiu Savin and Enrico Valdinoci},
     title = {All functions are locally $s$-harmonic up to a small error},
     journal = {Journal of the European Mathematical Society},
     pages = {957--966},
     publisher = {mathdoc},
     volume = {19},
     number = {4},
     year = {2017},
     doi = {10.4171/jems/684},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/684/}
}