@article{10_4007_annals_2005_161_509,
     author = {Charles Fefferman},
     title = {A sharp form of {Whitney{\textquoteright}s} extension theorem},
     journal = {Annals of mathematics},
     pages = {509--577},
     publisher = {mathdoc},
     volume = {161},
     number = {1},
     year = {2005},
     doi = {10.4007/annals.2005.161.509},
     mrnumber = {2150391},
     zbl = {1102.58005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2005.161.509/}
}