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CHANGING PUPILS’ CONCEPTIONS ABOUT WEIGHT APPLYING VARIATION THEORY. Problems of Education in the 21st Century , Problems of Education in the 21st Century , 1. presented at the August/2007. Retrieved from http://oaji.net/articles/2014/457-1392217372.pdf
(2007). 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
(2008).