@article{10_4007_annals_2006_164_361,
     author = {Edward Bierstone and Pierre D. Milman and Wies{\l}aw Paw{\l}ucki},
     title = {Higher-order tangents and {Fefferman{\textquoteright}s} paper on {Whitney{\textquoteright}s} extension problem},
     journal = {Annals of mathematics},
     pages = {361--370},
     publisher = {mathdoc},
     volume = {164},
     number = {1},
     year = {2006},
     doi = {10.4007/annals.2006.164.361},
     mrnumber = {2233851},
     zbl = {1109.58015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2006.164.361/}
}