M. Khoukhi,  Change of the Thermal Conductivity of Polystyrene Insulation in term of Temperature at the Mid Thickness of the Insulation Material: Impact on the Cooling Load .   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2016, vol. 113(5). 884 - 888
    [viewed 16 October 2019]. Available from: https://publications.waset.org/pdf/10004391.