Njegovan, M., Weisman, R., Ito, S. and Mewhort, D. (1993) “How grouping improves the categorisation of frequency in song birds and humans and why song birds do it better”, Canadian Acoustics, 21(3), pp. 87–88. Available at: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/787 (Accessed: 19 April 2024).