Popp, D. (2001). Pollution control innovations and the clean air act of 1990. National Bureau of Economic Research.
Citace podle Chicago (17th ed.)Popp, David. Pollution Control Innovations and the Clean Air Act of 1990. Cambridge: National Bureau of Economic Research, 2001.
Citace podle MLA (9th ed.)Popp, David. Pollution Control Innovations and the Clean Air Act of 1990. National Bureau of Economic Research, 2001.
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