1. Revision of the International Health Regulations: progress report, February 2001;Wkly Epidemiol Rec,2001
2. WHO. International Health Regulations (2005). 2nd ed.; 2008, [accessed 16.02.11].
3. WHO. Regional Office for South-East Asia. Epidemiological Surveillance and International Health Regulations. Report of an intercountry meeting, Colombo; 15–18 December 1998. Report No. SEA/EPID/126.
4. Cooper D, van Aston L. Syndromic surveillance – a European perspective. The International Society for Disease Surveillance: Global Outreach Committee eNewsletter; September 2008, [accessed 18.02.11].
5. Evaluation challenges for syndromic surveillance—making incremental progress;Sosin;MMWR Morb Mortal Wkly Rep,2004