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@INCOLLECTION{ato2011,
author = {Tonello, Amadeo},
title = {Ley Natural},
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/ley_natural/Ley_natural.html}
}