1. The 2009 Ageing Report: economic and budgetary projections for the EU-27 Member States (2008-2060) Luxembourg: Joint Report prepared by the European Commission (DG ECFIN) and the Economic Policy Committee (AWG). 2009
2. BureauUC. Population by Age and Sex for the United States: 1900 to 2000. PartACensus 2000 Special Reports, Series CENSR-4: US Administration on Aging. , 2002
3. US Census Bureau PD. Projections of the Population by Age and Sex for the United States: 2010 to 2050. US Census Bureau, Population Division, 2008.
4. The Worldwide Impact of the Seven-valent Pneumococcal Conjugate Vaccine