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7Brent Thompson. Ethics Overkill on the Hill? Washington Times, Cec. 4, 1995, p. 16.
8Wallis, John. The Concept of Systematic Corruption in American Political and Economic History, NBER Working Paper,2004, No. 10952.
9Susan Rose-Ackerman. Corruption, A Study in Political Economy, New York: Academy Press, 1978.
10Robert Klitgaard. Controlling Corruption, Berkeley: University of California Press, 1958.
