@Misc{ LeDPinSpe17, author = { Le Donne, Enrico and Pinamonti, Andrea and Speight, Gareth }, title = { Universal differentiability sets and maximal directional derivatives in Carnot groups }, journal = { }, year = { 2017 }, pages = { }, URL = { http://cvgmt.sns.it/paper/3440/ }, note = { cvgmt preprint} }