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“A: Harmonious Foundations.” Beautiful Mathematics, by Martin Erickson, 1st ed., Mathematical Association of America, Washington, DC, 2011, pp. 139–150, Accessed 14 Aug. 2020.
Erickson, M. (2011). A: Harmonious Foundations. In Beautiful Mathematics (pp. 139-150). Washington, DC: Mathematical Association of America. Retrieved August 14, 2020, from
Erickson, Martin. "A: Harmonious Foundations." In Beautiful Mathematics, 139-50. Washington, DC: Mathematical Association of America, 2011. Accessed August 14, 2020.

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