5United Nations Population Division (2007), DESA. World Population Prospects: The 2006 Revision Population Aging. 7 -8.
6Yoshiro Hayashi( 1993 ) ,The medical care system in an aging society, Japan and the World Economy, Volume 5, Issue 2, July, 173 - 177.
7William E. Steslicke( 1984 ), Medical Care for Japan's Aging Population : An Introduction, Pacifw Affairs, Vol. 57, No. 1,45 - 52.
8Efika Schulz,Reiner Leidl, Hans- Helmut Konig(2004) ,The impact of ageing on hospital care and long- term care--the example of Germany,Health Policy, Volume 67, Issue 1 ,January,57 - 74.
9D. Michaeli, D. Ficu, G. Mor, H. Har Paz( 1984 ), Aging of the Population of a City and Its Implications for Hospital - Based Services : The Example of Tel Aviv - Yaffo, Public Health Reports ( 1974 - ) , Vol. 99, No. 5,446 -449.
10Frank T. Denton, Amiram Gafni, Byron G. Spencer( 2001 ) ," Exploring the effects of population change on the costs of physician serv- ices. " QSEP Research Report, April , No. 358.