DIN CEN/TS 15511
DIN CEN/TS 15511 Postal services - Quality of service - Information available on postal services; German version CEN/TS 15511:2008
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 06/01/2008
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 06/01/2008