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| Authors: | Richard E Wagner Donald J Boudreaux Frank Forman Stefan Voigt |
| Institution: | 1. George Mason University, Fairfax 2. Clemson University, Clemson 3. U.S. Department of Education, 20202-4245, Washington, DC 4. Albert-Ludwigs-Universit?t Freiburg, Freiburg |
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| 本文献已被 SpringerLink 等数据库收录！ | |