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Mathematics in Computer Science > 2019 > 13 > 1-2 > 95-104
International Journal of Science and Mathematics Education > 2004 > 2 > 3 > 339-352
Technology, Knowledge and Learning > 2002 > 7 > 2 > 145-165
Educational Studies in Mathematics > 2000 > 44 > 1-2 > 5-23
Educational Studies in Mathematics > 2000 > 44 > 1-2 > 5-23