Hunter, Jane; Zhan, Zhimin. <a href="http://archive.dstc.edu.au/RDU/staff/jane-hunter/PNG/paper.html">&ldquo;An Indexing and Querying System for Online Images Based on the PNG Format and Embedded Metadata&rdquo;</a> in: <cite>ARLIS/ANZ Conference.</cite> Sep 1999. Brisbane, Australia. URL: <a href="http://archive.dstc.edu.au/RDU/staff/jane-hunter/PNG/paper.html">http://archive.dstc.edu.au/RDU/staff/jane-hunter/PNG/paper.html</a>