http://www.newscientist.com/article/mg12817424.500-tracking-down-the-noise-polluters-a-chanting-football-crowd-seems-deafening-but-the-sound-energy-it-generates-is-barely-enough-to-fry-an-egg-modern-technology-and-tougher-legislation-have-encouraged-engineers-to-confront-the-problems-of-measuring-sound.html

http://www.newscientist.com/article/mg13017745.200-technology-splitting-the-difference-for-a-standard-studio-sound.html

http://esciencenews.com/articles/2008/06/10/how.brain.separates.audio.signals.noise

http://www.soundonsound.com/sos/jan11/articles/studio-sos-0111.htm