Presented at Standard VS Standard conference. September 23, 2011 - http://www.pmi-nic.org/library.asp?pag=Eventi&ID=390&anno=2011&tit=Standard%20Vs%20Standard:%20dai%20concetti%20alla%20realt%E0%20industriale.%20LE%20ISCRIZIONI%20SONO%20CHIUSE