Footnotes

 (1)

http://www.algorithm.uni-bayreuth.de/en/research/SYMMETRICA/ accessed August 19, 2014.

 (2)

http://www.walterzorn.de/en/jsgraphics/jsgraphics_e.htm acessed August 19, 2014

 (3)

http://www.schillmania.com/projects/soundmanager2/ accessed August 19, 2014