academic article

• Trends in late-life activity limitations in the United States: an update from five national surveys..  Demography.  50:661-71. 2013
• Estimation of multi-state life table functions and their variability from complex survey data using the SPACE Program..  Demographic research.  22:129-158. 2010
• Resolving inconsistencies in trends in old-age disability: report from a technical working group..  Demography.  41:417-41. 2004