“Elegant Solutions.” Beautiful Mathematics, by Martin Erickson, 1st ed., Mathematical Association of America, Washington, DC, 2011, pp. 109–130, www.jstor.org/stable/10.4169/j.ctt13x0n39.9. Accessed 31 May 2020.
Erickson, M. (2011). Elegant Solutions. In Beautiful Mathematics (pp. 109-130). Washington, DC: Mathematical Association of America. Retrieved May 31, 2020, from www.jstor.org/stable/10.4169/j.ctt13x0n39.9
Erickson, Martin. "Elegant Solutions." In Beautiful Mathematics, 109-30. Washington, DC: Mathematical Association of America, 2011. Accessed May 31, 2020. www.jstor.org/stable/10.4169/j.ctt13x0n39.9.
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