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@INCOLLECTION{sba2007,
 author = {Barrena, Sara and Nubiola, Jaime},
 title = {Charles Sanders Peirce},
 booktitle = {\emph{Philosophica}: Enciclopedia filosófica \emph{on line}},
 year = {2007},
 editor = {Fernández Labastida, Francisco and Mercado, Juan Andrés},
 url = {http://www.philosophica.info/archivo/2007/voces/peirce/Peirce.html}
 }