Stewart, Ian. “Fearful Symmetry.” The Best Writing on Mathematics 2013, edited by Mircea Pitici, by ROGER PENROSE, Princeton University Press, PRINCETON; OXFORD, 2014, pp. 23–31, www.jstor.org/stable/j.ctt4cgb74.6. Accessed 29 Nov. 2020.
Stewart, I. (2014). Fearful Symmetry. In PENROSE R. (Author) & Pitici M. (Ed.), The Best Writing on Mathematics 2013 (pp. 23-31). PRINCETON; OXFORD: Princeton University Press. Retrieved November 29, 2020, from http://www.jstor.org/stable/j.ctt4cgb74.6
Stewart, Ian. "Fearful Symmetry." In The Best Writing on Mathematics 2013, edited by Pitici Mircea, by PENROSE ROGER, 23-31. PRINCETON; OXFORD: Princeton University Press, 2014. Accessed November 29, 2020. http://www.jstor.org/stable/j.ctt4cgb74.6.
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