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Testing. (with Annika B. Bergbauer and Ludger Woessmann). NBER Working Paper No. 24836 (revised), National Bureau of Economic Research, July 2018 (revised November 2019).
The Market for Teacher Quality. (with John F. Kain, Daniel M. O'Brien, and Steven G. Rivkin)
. NBER Working Paper 11154, National Bureau of Economic Research, February 2005.