1. Hadler, S. C. Global impact of hepatitis A virus infection. Changing patterns. In:Hollinger, F. B., Lemon, S. M., Margolis, H. S. (eds.): Proceedings of the 1990 International Symposium on Viral Hepatitis and Liver Disease. Williams & Wilkins, Baltimore 1991, pp. 14–19.
2. Hadler, S. C., McFarland, L. Hepatitis in day care centers: epidemiology and prevention. Rev. Infect. Dis. 8 (1986) 548–557.
3. Centers for Disease Control Hepatitis A among drug abusers. MMWR 37 (1988b) 297–305.
4. Frösner, G., Willers, H., Müller, R., Schenzel, D., Deinhardt, F., Höpken, W. Decrease in incidence of hepatitis A infections in Germany. Infection 6 (1978) 259–260.
5. Yao, G. B. Clinical spectrum and natural history of viral hepatitis A in 1988 Shanghai epidemic. In:Hollinger, F. B., Lemon, S. M., Margolis, H. S. (eds.): Proceedings of the 1990 International Symposium on Viral Hepatitis and Liver Disease. Williams & Wilkins, Baltimore 1991, pp. 76–77.