1. Total dependency ratio (<20 & 65+)/(20-64) by major area, region and country, 1950-2100 (ratio of population 0-19 and 65+ per 100 population. World Population Prospects: The 2010 Revision,2011
2. Trends in severe disability among elderly people: assessing the evidence in 12 oecd countries and the future implications;Lafortune G;OECD Papers.,2007
3. Fórum Sociológico;Dionísio BM,2001
4. Classificação Internacional de Funcionalidade, Incapacidade e Saúde,2004
5. Setting Up a Cohort Study on Functioning: Deciding What to Measure;Cieza A;Am J Phys Med Rehab.,2011