@Article{ Spe14a, author = { Speight, Gareth }, title = { Lusin Approximation and Horizontal Curves in Carnot Groups }, journal = { Revista Matematica Iberoamericana }, year = { 2015 }, volume = { 32 }, number = { 4 }, pages = { 1425-1446 }, URL = { http://cvgmt.sns.it/paper/2579/ }, note = { cvgmt preprint} }