“The Prize Competition of 1880.” Henri Poincare: A Scientific Biography, by JEREMY GRAY, Princeton University Press, PRINCETON; OXFORD, 2013, pp. 207–252, www.jstor.org/stable/j.ctt1r2fwt.8. Accessed 3 Aug. 2021.
GRAY, J. (2013). The Prize Competition of 1880. In Henri Poincare: A Scientific Biography (pp. 207-252). PRINCETON; OXFORD: Princeton University Press. Retrieved August 3, 2021, from http://www.jstor.org/stable/j.ctt1r2fwt.8
GRAY, JEREMY. "The Prize Competition of 1880." In Henri Poincare: A Scientific Biography, 207-52. PRINCETON; OXFORD: Princeton University Press, 2013. Accessed August 3, 2021. http://www.jstor.org/stable/j.ctt1r2fwt.8.
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