Junxiang Zhang Chongfu Huang Cartographic Representation of the Uncertainty Related to Natural Disaster Risk: Overview and State of the Art. 213-220 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3327&spage=213 2004 conf/casdmkm/2004 CASDMKM db/conf/casdmkm/casdmkm2004.html#ZhangH04