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@INCOLLECTION{jof2009,
author = {Ordi i Fernández, Joan},
title = {Ludwig Wittgenstein},
booktitle = {\emph{Philosophica}: Enciclopedia filosófica \emph{on line}},
editor = {Fernández Labastida, Francisco and Mercado, Juan Andrés},
year = {2009},
url = {http://www.philosophica.info/archivo/2009/voces/wittgenstein/Wittgenstein.html}
}