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Article Matheson, George (2006)
Intervals and Ratios: the Invariantive Transformations of Stanley Smith Stevens. History of the Human Sciences (pp. 65-81). (/isis/citation/CBB000670858/) unapi

Article Feest, Uljana (2005)
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Chapter Feest, Uljana (2002)
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Article Hardcastle, Gary L. (1995)
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Article Miller, George A. (1975)
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