1. Interaction terms in logit and probit model;Ai;Economic Letters,2003
2. America's Health Insurance Plans, 2009. Individual health insurance 2009: a comprehensive survey of premiums, benefits, and affordability. http://healthinsurance.about.com.
3. The growth in social security disability rolls: a fiscal crisis unfolding;Autor;Journal of Economic Perspectives,2006
4. AWP Research, 2005. Health Care Survey. Final Report. Prepared for the National Association of the Self-Employed.
5. Bennefield, Robert L., 1996. A comparative analysis of health insurance coverage estimates: data from CPS and SIPP. In: Paper presented at the Joint Statistical Meetings, American Statistical Association.