@article{172805,
      note = {At head of title: Global Environment Monitoring System.},
      author = {Meybeck, M. (Michel) and Chapman, Deborah V. and Helmer,  Richard.},
      url = {http://digitallibrary.un.org/record/172805},
      title = {Global freshwater quality : a 1st assessment /},
      publisher = {Blackwell Reference, on behalf of WHO and UNEP,},
      recid = {172805},
      pages = {viii, 306 p. :},
      address = {Oxford, England :. 1990},
      year = {1990},
}