CITATION STYLE
Powell, A. B., Borge, I. C., Fioriti, G. I., Kondratieva, M., Koublanova, E., & Sukthankar, N. (2009). Challenging Tasks and Mathematics Learning. In New ICMI Study Series (Vol. 12, pp. 133–170). Springer. https://doi.org/10.1007/978-0-387-09603-2_5
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