Global survey of early warning systems. UNISDR 2006.
Global survey of early warning systems [pdf]Paper  bibtex   
@misc{ unisdr_global_2006,
  title = {Global survey of early warning systems},
  url = {http://www.unisdr.org/files/3612_GlobalSurveyofEarlyWarningSystems.pdf},
  urldate = {2015-06-29TZ},
  author = {{UNISDR}},
  year = {2006}
}
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