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References
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    * `rst and sphinx cheat sheet <http://openalea.gforge.inria.fr/doc/openalea/doc/_build/html/source/sphinx/rest_syntax.html#id3/>`_
    * `Sphinx setup <http://www.patricksoftwareblog.com/python-documentation-using-sphinx/>`_
    * `reStructuredText Markup Specification <http://docutils.sourceforge.net/docs/ref/rst/restructuredtext.html/>`_