Linux Gazette

参考文献

1. Raymond Gardner, rgardner@teal.csn.org, 1995 年 1 月 8 日 23:11:58 GMT, comp.graphics/comp.compression, 消息 ID <3eprfu$jqs@news-2.csn.net>。另请参阅 Michael Battilana 的文章，讨论 GIF/LZW 争议的法律历史：http://www.cloanto.com/users/mcb/19950127giflzw.html。
2. http://www.boutell.com/boutell/
3. http://www.w3.org/pub/WWW/Graphics/PNG/CS-950214.html
4. http://www.rpi.edu/~randeg/paleo_pngs.html
5. http://www.cdrom.com/pub/infozip/zlib/
6. ftp://swrinde.nde.swri.edu/pub/png/src/
7. http://www.wco.com/~png/
8. http://vag.vrml.org/VRML2.0/FINAL/spec/part1/conformance.html
9. http://www.w3.org/pub/WWW/TR/REC-png.html
10. http://quest.jpl.nasa.gov/PNG/pngapps.html
11. http://www.cis.ohio-state.edu/hypertext/faq/usenet/compression-faq/top.html