8Pan American Health Organization. Use of C.eogrphic Information Systems in Epidemiology (Epi-GIS). Epidemiological Bulletin. Vol. 17, No. 1 March 1996, in http://www.paho.org/english/sha/ epibul_95-98/be961gis.htm
9Mort KE, Nuttall I, Desjex P. New geographical approaches to control of some parasitic zoonoses [J]. WHO Bull, 1995, 73:247- 257.
10Briggs D J, Elliott P. The use of geographic information systems in studies on environment and health [J].Wld Hlth Statist Quart,1995, 48:85-94.
