@article{10_4007_annals_2007_166_779,
     author = {Charles Fefferman},
     title = {$C^m$ extension by linear operators},
     journal = {Annals of mathematics},
     pages = {779--835},
     publisher = {mathdoc},
     volume = {166},
     number = {3},
     year = {2007},
     doi = {10.4007/annals.2007.166.779},
     mrnumber = {2373373},
     zbl = {1161.46013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2007.166.779/}
}