DIN SPEC 1020-2009 无压地下排水和污水塑料管道系统.聚乙烯.第2部分:合格评价用指南;德文版本CEN/TS 1852-2-2009
Plastics piping systems for non-pressure underground drainage and sewerage - Polypropylene (PP) - Part 2: Guidance for the assessment of conformity; German version CEN/TS 1852-2:2009