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<a href="http://www.vias.org/pngguide/chapter11_04.html">PNG tTXt and zTXt chunks structures</a> from PNG definitive guide,<br>
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<a href="http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/PNG.html">PNG tags list</a> by Phil Harvey<br>
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Email communication with <a href="mailto:caulier dot gilles at gmail dot com">caulier dot gilles at gmail dot com</a><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)