1. American Medical Association (2003-2010). Competition in health insurance: a comprehensive study of U.S. markets. http://www.worldcat.org/title/competition-in-health-insurance-a-comprehensive-study-of-us-markets/oclc/794006016 . Accessed 20 July 2015.
2. Bates, L., et al. (2012). Do health insurers possess market power? Southern Economic Journal, 78(4), 1289–1304.
3. Bergson, A. (1973). On monopoly welfare losses. American Economic Review, 63(5), 853–870.
4. Butler, H. N. and Ribstein, L. E. (2008-2009). The single-license solution. Regulation, 31, 36-42.
5. Dafny, L., et al. (2011). Data impediments to empirical work on health insurance markets. BE Journal of Economic Analysis and Policy, 11(2): Article 8.