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Keinonen, T., & Kärkkäinen, S. (2010). UNIVERSITY STUDENTS’ ARGUMENTATION IN SCIENCE AND ENVIRONMENTAL EDUCATION. 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/2014/457-1400515358.pdf
Kukkonen, J., Kärkkäinen, S., & Keinonen, T. (2012). UNIVERSITY STUDENTS’ INFORMATION SOURCES OF EDUCATION FOR SUSTAINABLE DEVELOPMENT ISSUES AND THEIR PERCEPTIONS OF ENVIRONMENTAL PROBLEMS. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 39. presented at the February/2012. doi:https://doi.org/10.33225/pec/12.39.94