Plastics piping systems for water supply – Polyethylene (PE) – Part 7: Guidance for the assessment of conformity; German version CEN/TS 12201-7:2003
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/2003

Plastics piping systems for water supply, and for drainage and sewerage under pressure – Polyethylene (PE) – Part 7: Guidance for the assessment of conformity; German version CEN/TS 12201-7:2014
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/2014