@Misc{ AnDiDoLe20, author = { Antonelli, Gioacchino and Di Donato, Daniela and Don, Sebastiano and Le Donne, Enrico }, title = { Characterizations of uniformly differentiable co-horizontal intrinsic graphs in Carnot groups }, journal = { Annales de l'Institut Fourier }, year = { 2020 }, pages = { }, URL = { http://cvgmt.sns.it/paper/4680/ }, note = { cvgmt preprint} }