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@INCOLLECTION{ufs2015,
author = {Ferrer Santos, Urbano},
title = {Xavier Zubiri},
booktitle = {\emph{Philosophica}: Enciclopedia filosófica \emph{on line}},
editor = {Fernández Labastida, Francisco and Mercado, Juan Andrés},
year = {2015},
url = {http://www.philosophica.info/archivo/2015/voces/zubiri/Zubiri.html}
}