1. D. Ackerberg, K. Caves, G. Frazer, Structural Identification of Production Functions, UCLA Mimeo, 2005.
2. B. Buckheit, Former EPA Enforcement Chief. Personal Testimony, Senate Democratic Policy Committee Hearing, February 6, Clearing the Air: An Oversight Hearing on the Administration's Clean Air Enforcement Program 〈http://democrats.senate.gov/dpc/dpc-hearing.cfm?A=11〉 (Last accessed January 2008), 2004.
3. J. Bushnell, C. Wolfram, Ownership Change, Incentives and Plant Efficiency: The Divestiture of U.S. Electric Generation Plants, CSEM Working Paper WP-140, University of California Energy Institute, Available at 〈www.ucei.org〉, March 2005.
4. Economies of scale in US electric power generation;Christensen;Journal of Political Economy,1976
5. D. Cusick, AEP Settlement Ends Long Battle Over Power Plant Upgrades, Greenwire, October 9, 2007.