@Misc{ MaaPin18, author = { Maalaoui, Ali and Pinamonti, Andrea }, title = { Interpolations and Fractional Sobolev Spaces in Carnot Groups }, journal = { Nonlinear Analysis }, year = { 2018 }, pages = { }, URL = { http://cvgmt.sns.it/paper/3997/ }, note = { cvgmt preprint} }