@Article{ CapLeDOtt16, author = { Capogna, Luca and Citti, Giovanna and Le Donne, Enrico and Ottazzi, Alessandro }, title = { Conformality and $Q$-harmonicity in sub-Riemannian manifolds }, journal = { }, year = { 2016 }, pages = { 64 }, URL = { http://cvgmt.sns.it/paper/3040/ }, note = { cvgmt preprint} }