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| Pinto, Fátima Cunha Ferreira, Firme, Thereza Penna and Letichevsky, Ana Carolina Voluntary national examination at conclusion of secondary school: a methodological challenge in Brazilian education. Ensaio: aval. pol. públ. educ., Sept 2004, vol.12, no.44, p.899-907. ISSN 0104-4036
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