Schaffer, Karl. “A Platonic Sextet for Strings.” Martin Gardner in the Twenty-First Century, edited by Michael Henle and Brian Hopkins, 1st ed., Mathematical Association of America, 2012, pp. 19–24, www.jstor.org/stable/10.4169/j.ctt13x0ng0.7. Accessed 3 Mar. 2021.
Schaffer, K. (2012). A Platonic Sextet for Strings. In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (pp. 19-24). Mathematical Association of America. Retrieved March 3, 2021, from http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.7
Schaffer, Karl. "A Platonic Sextet for Strings." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, 19-24. Mathematical Association of America, 2012. Accessed March 3, 2021. http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.7.
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