@Article{ kormag10, author = { Korte, Riikka and Magnani, Valentino }, title = { Measure of curves in graded groups }, journal = { Illinois J. Math. }, year = { 2012 }, volume = { 56 }, number = { 2 }, pages = { 353-366 }, URL = { http://cvgmt.sns.it/paper/1548/ }, note = { cvgmt preprint} }