@Misc{ FerLiuMan12a, author = { Ferrari, Fausto and Liu, Qing and Manfredi, Juan }, title = { ON THE CHARACTERIZATION OF p-HARMONIC FUNCTIONS ON THE HEISENBERG GROUP BY MEAN VALUE PROPERTIES. }, journal = { }, year = { 2012 }, pages = { }, URL = { http://cvgmt.sns.it/paper/1995/ }, note = { cvgmt preprint} }