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@INCOLLECTION{iys2011,
author = {Yarza de la Sierra, Ignacio},
title = {Porfirio},
booktitle = {\emph{Philosophica}: Enciclopedia filosófica \emph{on line}},
editor = {Fernández Labastida, Francisco and Mercado, Juan Andrés},
year = {2011},
url = {http://www.philosophica.info/archivo/2011/voces/porfirio/Porfirio.html}
}