1. KinseUa K, Velkoff VA. An aging world: 2001. U.S. Census Bureau International Population Reports P95/01-1. Washington, DC: U.S. Government Printing Office, November 2001.
2. OECD Health Data 19%. A software for the comparative analysis of 27 health systems. OECD Electronic Editions, 1996.
3. Ministere della Sanità, Dipartimento della Programmazione (Ministry of Health, Dept. of Planning). Flussi informativi delle Unità Sanitarie Locali (Information fluxes of the Local Health Agencies), 1996.
4. Lori A, Golini A, Contalini B. Atlante dell’invecchiamento della popolazione (Atlas for the aging of the population). Roma: C.N.R., 1995.
5. Lopez A. The Impact of demographic trends on health. World Health Statistics Quarterly 1987; 40: 2–5.