OECD (2008), "Table D5.2 - National periodical assessments in general education programmes (lower secondary education, 2006): Do you have national periodical assessments in your country?", in Education at a Glance 2008: OECD Indicators, OECD Publishing, Paris, https://doi.org/10.1787/eag-2008-tabled5_2-en.

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