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1ανά Eric A. Hanushek, Stephen Machin, Ludger WoessmannFull text available on ScienceDirect[4/6/11]
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2ανά Eric A. Hanushek, Stephen Machin, Ludger WoessmannFull text available on ScienceDirect[4/27/16]
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3ανά Eric A. Hanushek, Stephen Machin, Ludger WoessmannFull text available on ScienceDirect[9/29/11]
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