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Lorke, J., & Sommer, K. (2010). TEACHING CHROMATOGRAPHY IN SECONDARY SCHOOL - AN INVESTIGATION CONCERNING GRADE, CONTEXT, CONTENT, EXPERIMENTS AND MEDIA. Problems of Education in the 21st Century , Problems of Education in the 21st Century , 19. presented at the March/2010. Retrieved from http://oaji.net/articles/2014/457-1399917392.pdf