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Beaton, A. E., Martin, M. O., Mullis, I. V. S., Gonzales, E. J., Smith, T. A., & Kelly, D. L. (1996a). Science achievement in the middle school years: IEA´s Third International Mathematics and Science Study (TIMSS). Chestnut Hill, MA: Boston College.
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Beaton, A. E., Martin, M. O., Mullis, I. V. S., Gonzales, E. J., Smith, T. A., Kelly, D. L. (1996). Science achievement in the middle school years. Chestnut Hill, MA: Boston College. IEA ́s Third International Mathematics and Science Study (TIMSS.
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