• Barros, P.P. and X. Martinez-Giralt, 2009, Contractual design and PPPs for hospitals: lessons for the Portuguese model, The European Journal of Health Economics, 10(4): 437-453. Abstract
• Barros, P.P., and X. Martinez-Giralt, 2008, On insurance and the cost-sharing of pharmaceutical R&D, International Journal of Health Care Finance and Economics, 8(4): 301-312. Abstract
• Barros, P.P., and X. Martinez-Giralt, 2008, Selecting Health Care Providers:"Any Willing provider" vs. Negotiation, European Journal of Political Economy, 24(2): 402-414. Abstract
• Barros,  P.P., B. Garcia-Mariñoso,  I. Jelovac, X. Martinez-Giralt, and P. Olivella, 2006,  Competition in Health Provision and Insurance, Fundación BBVA.
• Barros, P.P., and X. Martinez-Giralt, 2005, Bargaining and Idle Public Sector Capacity in Health Care, Economics Bulletin, 9(5): 1-8.