1. Getting the unemployed back to work: the role of targeted wage subsidies;Bell;International Tax and Public Finance,1999
2. Belli, P., 2003. Ten years of health reforms in former socialist economies: lessons learned and options for the future. Harvard School of Public Health, Cambridge, MA. Working Paper, International Health Systems Group.
3. How much should we trust differences-in-differences estimates?;Bertrand;Quarterly Journal of Economics,2004
4. Hospital case payment systems in Europe;Busse;Health Care Management Science,2006
5. Microeconometrics: Methods and Applications;Cameron,2005