@article{AIF_2007__57_4_1023_0, author = {Mustapha, Sami and Vigneron, Fran\c{c}ois}, title = {Construction of {Sobolev} spaces of fractional order with sub-riemannian vector fields}, journal = {Annales de l'Institut Fourier}, pages = {1023--1049}, publisher = {Association des Annales de l{\textquoteright}institut Fourier}, volume = {57}, number = {4}, year = {2007}, doi = {10.5802/aif.2285}, mrnumber = {2339325}, zbl = {1143.46021}, language = {en}, url = {http://archive.numdam.org/articles/10.5802/aif.2285/} }