1. Instability in an SIR-model with age-dependent susceptibility,;V. Andreasen;in: O. Arino,1995
2. Heterogeneity in epidemic models and its effect on the spread of infection,;H. Andersson;J. App. Prob.,1998
3. Infectious Diseases of Humans: Dynamics and Control,;R. M. Anderson;Oxford University Press,1991
4. Nonnegative Matrices in the Mathematical Sciences,;A. Berman;Academic Press,1979
5. Vertically Transmitted Diseases: Models and Dynamics,;S. Busenberg;Springer,1993