http://web.archive.org/web/20070203225204/http://users.bestweb.net/~hobbs/footprints/fpspie11.pdf Thermographic camera on the cheap http://blog.makezine.com/archive/2009/07/thermographic_camera_on_the_cheap.html?CMP=OTC-0D6B48984890 2009-07-03 http://makezine.com/images/logos/rss_icon.jpg