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correición de nomes propios: -"Umberto Ecu" +"Umberto Eco"
|publisher= Open Book Publishers
|url= http://www.openbookpublishers.com/product/397/knowledge-and-the-norm-of-assertion--an-essay-in-philosophical-science/42469331bb1d787aa245c5b76c49762d}}
*Umberto EcuEco. Semiotics and the Philosophy of Language. 1986 Indiana University Press, ISBN 9780253203984.
 
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