7Wang, L. FS. , Wang, Y. C. , Zhao, L. 2009b, "Privatization and the Environment in an International Mixed Oligopoly with Pollution Abatement", Economics Bulletin, 29 (4) : pp. 3112--3119.
9Hart, O. , A. Shleifer and R. Vishny, 1997, "The Proper Scope of Government : Theory and an Application to Prisons", The Quarterly Journal of Economics, 114 (4) : pp. 1127--1161.
10Shleifer, Andrei. , 1998 , State versus Private Ownership, National Bureau of Economic Research Working Paper. No. w6665.