Biological classification of rivers - Part 2: Guidance on the presentation of biological quality data from surveys of benthic macroinvertebrates (ISO 8689-2:2000); English version of DIN EN ISO 8689-2
水质河流的生物分类第2部分:底栖大型无脊椎动物调查生物质量数据表示指南;德文版EN ISO 8689-2:2000