The Hammett Equation.
By C. D. Johnson. Pp. viii+196. (Cambridge University: London, October 1973). £4.50; $13.50.
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GOLD, V. Rho–sigma relations. Nature 249, 599–600 (1974). https://doi.org/10.1038/249599b0
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DOI: https://doi.org/10.1038/249599b0
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