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Cambridge, Mass. [u.a.]: MIT Press, 2007
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Oxford [u.a.]: Oxford University Press, 2006
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[S.l.]: SSRN, [2014]
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Cambridge, Mass: National Bureau of Economic Research, January 2005
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Cambridge, Mass: National Bureau of Economic Research, October 2005
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Cambridge, Mass: National Bureau of Economic Research, December 2004
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Cambridge, Mass: National Bureau of Economic Research, September 2003
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Cambridge, Mass: National Bureau of Economic Research, December 2004
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Cambridge, Mass: National Bureau of Economic Research, October 2002
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Cambridge, Mass: National Bureau of Economic Research, June 2002
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Cambridge, Mass: National Bureau of Economic Research, October 2001
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Cambridge, Mass: National Bureau of Economic Research, May 1999
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Cambridge, Mass: National Bureau of Economic Research, April 1997
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Cambridge, Mass: National Bureau of Economic Research, February 1997
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Cambridge, Mass: National Bureau of Economic Research, December 1994
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Cambridge, Mass: National Bureau of Economic Research, October 1992
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[S.l.]: SSRN, [2014]
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Cambridge, Mass: National Bureau of Economic Research, October 2009
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Cambridge, Mass: National Bureau of Economic Research, November 2004
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Cambridge, Mass: National Bureau of Economic Research, April 2002