Gambassi G., Lapane K.L, Sgadari A., Carbonin P., Gatsonis C., Lipsitz L.A, Mor V., Bernabei R..  2000.  Effects of angiotensin-converting enzyme inhibitors and digoxin on health outcomes of very old patients with heart failure. SAGE Study Group. Systematic Assessment of Geriatric drug use via Epidemiology. Arch Intern Med. 160(1):53-60.

Lukas A., Mayer B., Onder G., Bernabei R., Denkinger M.D.  2015.  Pain therapy in German long-term care facilities in a European comparison: Results of the SHELTER study. Schmerz. 29(4):411-421.