CITATION STYLE
Protasov, V., Applebaum, M., Karp, A., Kašuba, R., Sossinsky, A., Barbeau, E., & Taylor, P. (2009). Challenging problems: Mathematical contents and sources. In New ICMI Study Series (Vol. 12, pp. 11–51). Springer. https://doi.org/10.1007/978-0-387-09603-2_2
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