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(1991). Note on the integration of prototype theory and fuzzy-set theory. Synthese 86 (1), pp. 1-27.

(1988). "Prototypes" and "fuzziness" in the logic of concepts. Synthese 75 (3), pp. 317-347.

(1988). Fuzziness of concepts and concepts of fuzziness. Synthese 75 (3), pp. 349-372.