Grey, John M.; Gordon, John W. (1978). "Perceptual effects of spectral modifications on musical timbres". The Journal of the Acoustical Society of America. 63 (5). Acoustical Society of America (ASA): 1493–1500. Bibcode:1978ASAJ...63.1493G. doi:10.1121/1.381843. ISSN0001-4966.
Grey, John M.; Gordon, John W. (1978). "Perceptual effects of spectral modifications on musical timbres". The Journal of the Acoustical Society of America. 63 (5). Acoustical Society of America (ASA): 1493–1500. Bibcode:1978ASAJ...63.1493G. doi:10.1121/1.381843. ISSN0001-4966.
Grey, John M.; Gordon, John W. (1978). "Perceptual effects of spectral modifications on musical timbres". The Journal of the Acoustical Society of America. 63 (5). Acoustical Society of America (ASA): 1493–1500. Bibcode:1978ASAJ...63.1493G. doi:10.1121/1.381843. ISSN0001-4966.