Biological classification of rivers - Part 1: Guidance on the interpretation of biological quality data from surveys of benthic macroinvertebrates (ISO 8689-1:2000); English version of DIN EN ISO 8689-1
水质河流的生物分类第1部分:底栖大型无脊椎动物调查生物质量数据的解释指南;德文版EN ISO 8689-1:2000