Weblog: LED Cube Modeller, Paraflows edition, and Hacking OpenGL (in Lisp); Miscellanious ; 2 April 2005; 3 November 2006 http://blog.matroid.org/display/8
Wiki : Geschreven door publiek, light emittingdiode, laatste update13 september 2006, 3 November 2006 http://en.wikipedia.org/wiki/Led