1. US Bureau of the Census: Decennial Census; 1900-1980 Projections of the population of the United States. 1982-2050. Current Population Report, No 922, October 1982, Middle series projection, p 25
2. Changes in mortality among the elderly: United States 1940-1948;Fingerhut,1982
3. National Center for Health statistics: Use of Nursing Home by the Elderly: Preliminary data from the 1985 National Nursing Home Survey. Advance Data from Vital and Health Statistics 135. DHHS, vol no (PHS) 87-1250. Hyattsville, MD, Government Printing Office, 1987
4. Health Aspects;Schick,1986
5. Report of the Institute of Medicine: Academic geriatrics for the year 2000;J Am Geriatric Soc,1987