WASET
    S. Kong Wang,  Solar Energy Collection using a Double-layer Roof.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2012, vol. 65(5). 991 - 997
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/7761.