EN 14508 [documento electrónico] : 2003+A1: postal services: quality of service: measurement of the transit time of end-to-end services for single piece non-priority mail and second class mail / European Committee for Standardization
EN 14534 [documento electrónico] : 2003+A1: postal services: quality of service: measurement of the transit time of end-to-end services for bulk mail / European Committee for Standardization