“Pleasing Proofs.” Beautiful Mathematics, by Martin Erickson, 1st ed., Mathematical Association of America, Washington, DC, 2011, pp. 83–108, www.jstor.org/stable/10.4169/j.ctt13x0n39.8. Accessed 18 June 2021.
Erickson, M. (2011). Pleasing Proofs. In Beautiful Mathematics (pp. 83-108). Washington, DC: Mathematical Association of America. Retrieved June 18, 2021, from http://www.jstor.org/stable/10.4169/j.ctt13x0n39.8
Erickson, Martin. "Pleasing Proofs." In Beautiful Mathematics, 83-108. Washington, DC: Mathematical Association of America, 2011. Accessed June 18, 2021. http://www.jstor.org/stable/10.4169/j.ctt13x0n39.8.
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