Shrinking classroom age variance raises student achievement: evidence from developing countries
Wang, Liang Choon - 2011 - English
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Informe Latinoamericano del ICCS 2009: actitudes y conocimientos cívicos de estudiantes de secundaria en seis países de América Latina
Schulz, Wolfram ; Friedman, Tim ; Ainley, John ; Lietz, Petra - 2011 - Spanish