Cornell University Library Historical Math Monographs
Chapter V: Descartes's rule of signs
First available in Project Euclid: 12 January 2010
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Todhunter, I. Chapter V: Descartes's rule of signs. An elementary treatise on the theory of equations, 40--47, Macmillan and Co, London, 1875. https://projecteuclid.org/euclid.chmm/1263315265