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Ahtee, M., Lavonen, J., & Pehkonen, E. (2008). REASONS BEHIND THE FINNISH SUCCESS IN SCIENCE AND MATHEMATICS IN PISA TESTS. Problems of Education in the 21st Century , Problems of Education in the 21st Century , 6. presented at the May/2008. Retrieved from http://oaji.net/articles/2014/457-1392232848.pdf
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Gedrovics, J., Lavonen, J., & Raipulis, J. (2010). APPLICATION OF THE DIFFERENT DEVELOPMENT INDEXES IN THE RESEARCH OF SCIENCE DIDACTICS. Problems of Education in the 21st Century , Problems of Education in the 21st Century , 22. presented at the June/2010. Retrieved from http://oaji.net/articles/2014/457-1400515203.pdf