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Stefanova, Y., & Minevska, M. (2009). CONSTRUCTIVIST LEARNING: DESCRIPTION, EXPLANATION, PREDICTION IN A CHEMISTRY CLASSROOM. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 17. presented at the November/2009. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=900339
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Stefanova, Y., Minevska, M., & Evtimova, S. (2010). SCIENTIFIC LITERACY: PROBLEMS OF SCIENCE EDUCATION IN BULGARIAN SCHOOL. Problems of Education in the 21st Century , Problems of Education in the 21st Century , 19. presented at the March/2010. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=908753