Cohen, A. J., Lamoureux, M., Fleming, R., & Dunphy, D. (1998). Judged direction of pairs of octave-related complexes (Shepard tones): Training effects and reversal. Canadian Acoustics, 26(3), 58–59. Retrieved from https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1156