Bernabei R., Gambassi G., Lapane K., Sgadari A., Landi F., Gatsonis C., Lipsitz L., Mor V..  1999.  Characteristics of the SAGE database: a new resource for research on outcomes in long-term care. SAGE (Systematic Assessment of Geriatric drug use via Epidemiology) Study Group. J Gerontol A Biol Sci Med Sci. 54(1):M25-33.

Carpenter G.I, Hirdes J.P, Ribbe M.W, Ikegami N., Challis D., Steel K., Bernabei R., Fries B..  1999.  Targeting and quality of nursing home care. A five-nation study. Aging-Clinical & Experimental Research. 11(2):83-9.

Lattanzio F., Mussi C., Scafato E., Ruggiero C., Dell'Aquila G., Pedone C., Mammarella F., Galluzzo L., Salvioli G., Senin U. et al..  2010.  Health care for older people in Italy: The U.L.I.S.S.E. Project (Un link informatico sui servizi sanitari esistenti per l'anziano - a computerized network on health care services for older people). J Nutr Health Aging. 14(3):238-42.