Economic gains for U.S. States from educational reform / Eric A. Hanushek (Hoover institution, Stanford University, CESifo, IZA and NBER), Jens Ruhose (ifo institute, University of Munich and IZA), Ludger Woessmann (University of Munich, ifo institute, CESifo and IZA). Bonn : IZA, 2015
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