http://www.asi.org/adb/09/09/sdwr.html
http://www.nvinet.com/~cffc/page2.htm
http://www.teleport.com/~rfrederi/L5/index.shtml
http://www.bigelow-aerospace.com/links.html
http://homepages.ihug.co.nz/~rorylind/index.html