1. Analysing air travel: a comparison of different survey methods and data collection procedures.;Denstadli;J Travel Res,2000
2. Office for National Statistics. Travel trends 2004: a report on the international passenger survey. Basingstoke (UK): Palgrave Macmillan; 2005.
3. Severe Acute Respiratory Syndrome (SARS) Expert Committee. SARS in Hong Kong: from experience to action: severe acute respiratory syndrome (SARS). Expert Committee of Hong Kong. 2003. [cited 2007 Jun 21]. Available from http://www.sars-expertcom.gov.hk/english/reports/reports.html
4. Forecast and control of epidemics in a globalized world.;Hufnagel;Proc Natl Acad Sci U S A,2004
5. The worldwide air transportation network: anomalous centrality, community structure, and cities’ global roles.;Guimera;Proc Natl Acad Sci U S A,2005