@Misc{ CapPinSpe22, author = { Capolli, Marco and Pinamonti, Andrea and Speight, Gareth }, title = { Maximal Directional Derivatives in Laakso Space }, journal = { Communications in Contemporary Mathematics }, year = { 2022 }, pages = { }, URL = { http://cvgmt.sns.it/paper/5682/ }, note = { cvgmt preprint} }