1. Infectious Diseases of Humans, Dynamics and Control;Anderson,1991
2. Cholera 2006;Anon.;Wkly. Epidemiol. Rec.,2007
3. The Mathematical Theory of Infectious Diseases;Bailey,1975
4. Nonnegative matrices in the mathematical sciences;Berman;SIAM Rev.,1993
5. Mathematical Models in Population Biology and Epidemiology;Brauer,2000