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Burhan, Nik Ahmad Sufian and Md. Yunus, Melor and Tovar, María Elena Labastida and Burhan, Nik Mohd Ghazi (2016): Why are cognitive abilities of children so different across countries? The link between major socioeconomic factors and PISA test scores. Published in: Personality and Individual Differences , Vol. 105, (January 2017): pp. 95-106.
