Browning, D. G., R. H. Mellen, and M. A. Jarrell. “Sound From Resonances in Sports Equipment: Can It Be Used to Evaluate Athletic Performance”. Canadian Acoustics, vol. 23, no. 3, Sept. 1995, pp. 75-76, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/948.