1. “A Comparison of Some Loudness Measures for Loudspeaker Listening Tests,”;Aarts;J. Audio Eng. Soc.,1992
2. “New Horizons in Listening Test Design,”;AES Staff Writer;J. Audio Eng. Soc.,2004
3. The Inventor of Stereo—The Life and Works of Alan Dower Blumlein;Alexander,1999
4. “The X-Curve: Its Origins and History”;;Allen;SMPTE Motion Imaging Journal,2006
5. Allen, J.F. (2001). “The Mythical ‘X’ Curve,” originally in Boxoffice Magazine, available at www.hps4000.com/pages/general/the_mythical_X_curve.pdf.