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@brief PGF image, implemented using the following references:
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<a href="http://www.libpgf.org/uploads/media/PGF_stamm_wscg02.pdf">PGF specification</a> from libpgf web site<br>
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@author Andreas Huggel (ahu)
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<a href="mailto:ahuggel@gmx.net">ahuggel@gmx.net</a>
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@author Gilles Caulier (cgilles)