Hartnett, Kevin. “An Abc Proof Too Tough Even for Mathematicians.” The Best Writing on Mathematics 2013, edited by Mircea Pitici, by ROGER PENROSE, Princeton University Press, PRINCETON; OXFORD, 2014, pp. 225–230, www.jstor.org/stable/j.ctt4cgb74.24. Accessed 29 Nov. 2020.
Hartnett, K. (2014). An abc Proof Too Tough Even for Mathematicians. In PENROSE R. (Author) & Pitici M. (Ed.), The Best Writing on Mathematics 2013 (pp. 225-230). PRINCETON; OXFORD: Princeton University Press. Retrieved November 29, 2020, from http://www.jstor.org/stable/j.ctt4cgb74.24
Hartnett, Kevin. "An Abc Proof Too Tough Even for Mathematicians." In The Best Writing on Mathematics 2013, edited by Pitici Mircea, by PENROSE ROGER, 225-30. PRINCETON; OXFORD: Princeton University Press, 2014. Accessed November 29, 2020. http://www.jstor.org/stable/j.ctt4cgb74.24.
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