@article{10_4007_annals_2006_164_313,
     author = {Charles Fefferman},
     title = {Whitney{\textquoteright}s extension problem for $C^m$},
     journal = {Annals of mathematics},
     pages = {313--359},
     publisher = {mathdoc},
     volume = {164},
     number = {1},
     year = {2006},
     doi = {10.4007/annals.2006.164.313},
     mrnumber = {2233850},
     zbl = {1109.58016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2006.164.313/}
}