Muhammad Ashraf Fauzi and  Nurhayati Abdul Malek and  Jamilah Othman,  Evaluation of Green Roof System for Green Building Projects in Malaysia.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2013, vol. 74(2). 75 - 81
    [viewed 18 May 2021]. Available from: https://publications.waset.org/pdf/1385.