Progress and key challenges in the delivery of adequate and sustainable pensions in Europe : joint report on pensions. Luxembourg : Office for Official Publications of the European Communities, 2010. 91 s. European economy. Occasional papers, no. 71. Available on Internet: <http://ec.europa.eu/economy_finance/publications/occasional_paper/2010/op71_en.htm> ISBN 978-92-79-16548-1.