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2 R. Casagrandi, "The SIRC model and influenza A" 200 : 152-169, 2006
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4 L.A.G. Ries, "SEER Cancer Statistics Review, 1975- 2001, National Cancer Institute, Bethesda, MD"
5 U.S. Environmental Protection Agency, "Respiratory Health Effects of Passive Smoking: Lung Cancer and Other Disorders" U.S. Environmental Protection Agency 1992
6 R.M. Anderson, "Population Biology of Infectious Diseases" Springer-Verlag 1982
7 T. Zhang, "Permanence and extinction for a nonautonomous SIRS epidemic model with time delay" 33 : 1058-1071, 2009
8 T. Zhang, "On a nonautonomous SEIRS model in epidemiology" 69 : 2537-2559, 2007
9 U.S. Department of Health and Human Services, "Nicotine Addiction: A Report of the Surgeon General" U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, Center for Health Promotion and Education, Office on Smoking and Health 1988
10 F. Brauer, "Mathematical Models in Population Biology and Epidemi-ology" Springer 2001
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19 W.O. Kermark, "Contributions to the Mathematical Theory of Epi-demics. Part II" 138 : 55-83, 1932
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