Ghinet, S., and N. Atalla. ‚ÄúTransmission Loss Optimization of Multi-Layer Noise Control Treatments‚ÄĚ. Canadian Acoustics, vol. 28, no. 3, Sept. 2000, pp. 96-97, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1307.