Tepe, Markus & Vanhuysse, Pieter (2010), 'Elderly Bias, New Social Risks, and Social Spending: Change and Timing in Eight Programs across Four Worlds of Welfare, 1980-2003', Journal of European Social Policy 20 (3): 218-234. & Tepe, Markus & Vanhuysse, Pieter (2009), 'Are Aging OECD Welfare States on the Path to Gerontocracy? Evidence from 18 Democracies, 1980-2002,' Journal of Public Policy, 29 (1): 1-28.
cited in United Nations Population Fund (2013) Population Trends and Policies in the UNECE Region: Outcomes, Policies and Possibilities: New York: UNFPA