German standard methods for the examination of water, waste water and sludge - Biological-ecological analysis of water (group M) - Part 1: Determination of the saprobic index in running waters (M 1)
德国水、废水和污泥检验的标准方法.水(M组)的生物生态分析.第1部分:流动水中腐生指数(M 1)的测定