DIN EN 13850:2007 邮政服务.服务质量.单件有优先权邮件和一级邮件点到点服务运送时间的测量(包括修改件A1:2007)
Postal service - Quality of service - Measurement of the transit time of end-to-end services for single piece priority mail and first class mail (includes Amendment A1:2007); English version of DIN EN 13850:2007-06