Paige, T. “Noise and Vibration Control for Natural-Gas-Fueled Electrical Cogeneration System Located Directly Above Penthouse Residential Suites in a High-Rise Apartment Building”. Canadian Acoustics, vol. 24, no. 3, Sept. 1996, pp. 57-57, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1029.