“Introduction.” Henri Poincare: A Scientific Biography, by JEREMY GRAY, Princeton University Press, PRINCETON; OXFORD, 2013, pp. 1–26, www.jstor.org/stable/j.ctt1r2fwt.5. Accessed 27 July 2021.
GRAY, J. (2013). Introduction. In Henri Poincare: A Scientific Biography (pp. 1-26). PRINCETON; OXFORD: Princeton University Press. Retrieved July 27, 2021, from http://www.jstor.org/stable/j.ctt1r2fwt.5
GRAY, JEREMY. "Introduction." In Henri Poincare: A Scientific Biography, 1-26. PRINCETON; OXFORD: Princeton University Press, 2013. Accessed July 27, 2021. http://www.jstor.org/stable/j.ctt1r2fwt.5.
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