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  Category:Philosophers by tradition – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Philosophers_by_tradition?uselang=de

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  Category:Linguists – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Linguists?uselang=de

  Keine Beschreibung vorhanden.

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  Category:Umberto Eco – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Umberto_Eco?uselang=de

  Keine Beschreibung vorhanden.

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  Tools and Modes of Representation in the Laboratory Sciences - Google Books

  http://books.google.de/books?id=Q7W6qtZZNxoC&pg=PA61&dq=non+existing+chemical+compounds&hl=de&ei=9R02Tf_1GtGv8QOoh_28BQ&sa=X&oi=

  constitutive of reference in laboratory sciences as cultural sign systems and their manipulation and superposition, collectively shared classifications and associated conceptual frameworks,· and various fonns of collective action and social institutions.…

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