1[1]C.J. Vorosmarty et al.Water stress in today's .and tomorrow's world. Global water resources: vulnerability from climate change and population growth. Science,2001,289:284 ～ 288.
3[3]Deborah M. Moll & R. Scott Summers. Assesment of Drinking Water Filter Microbial Communities Using Taxonomic and Metabolic Profiles[J]. Wat. Sci. Tech,1999.39(7). 83 - 89
