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Hempel, Carl G. (1952) Fundamentals of Concept Formation in Empirical Science. Inter- national Encyclopedia of Unified Science, Vol. 2, No. 7. Chicago: University of Chi- cago Press.
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Hempel, Carl G. (1952) Fundamentals of concept formation in empirical science. University of Chicago Press.
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Hempel, Carl G. (1952): Fundamentals of Concept Formation in Empirical Science. Inter- national Encyclopedia of Unified Science, Vol. 2, No. 7, Chicago: University of Chicago Press.
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