Klein, J., B. Zeitler, and B. Gover. “Effects of a Concrete Topping and Modified Resilient Interlayers on Sound Transmission through a Concrete Floor”. Canadian Acoustics, vol. 38, no. 3, Sept. 2010, pp. 172-3, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2300.