Abel, S. M. and Spencer, D. L. (1995) “Active Noise Cancellation vs. Passive Sound Attenuation: Help or Hindrance?”, Canadian Acoustics, 23(3), pp. 23-24. Available at: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/925 (Accessed: 18May2021).