L. Marcos Domínguez and  Nils Rage and  Ongun B. Kazanci and  Bjarne W. Olesen,  Effects of Free-Hanging Horizontal Sound Absorbers on the Cooling Performance of Thermally Activated Building Systems.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2017, vol. 122(2). 72 - 76
    [viewed 10 July 2020]. Available from: https://publications.waset.org/pdf/10006220.