6Stigler G. The theory of economic regulation. Bell Journal of Economics,1971,2:3-21.
7Ingo V. Incentive regulation and competition in public utility market: a 20-year perspective .Journal of Regulatory Economics,2002,22:15-27.
8Laffont JJ, Tirole J. A theory of incentives in procurement and regulation. The MIT Press, 1993.9-16.
9Laffont JJ, Tirole J. Competition in telecommunications. The MIT Press.Cambridge, MA. 2000. 24-26.
10White WD. Why is regulation introduced in the health sector? A look at occupational licensure. Journal of Health Politics, Policy and Law,1979, 4: 536-552.