由于学校图书馆买数据库不全，因此只能求助哪位大虾帮我上传这两篇文献！特别是jamiesun热心大侠们。在此先谢谢了！

Harford, J. D. (1991). "Measurement Error and State-Dependent Pollution-Control Enforcement." Journal of Environmental Economics and Management 21(1): 67-81.
 
Harford, J. D. and W. Harrington (1991). "A Reconsideration of Enforcement Leverage When Penalties Are Restricted." Journal of Public Economics 45(3): 391-395.

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