1. Megacities and natural disasters: a comparative analysis;Mitchell;Geojournal,1999
2. UNDP. World population prospects. The 2008 revision, 2009, 〈http://esa.un.org/unpp/〉.
3. Early warning systems for natural disasters reduction,2002
4. The status of earthquake early warning around the world: an introductory review;Allen;Seismol Res Lett,2009
5. Earthquake early warning systems,2007