WASET
    Nidal H. Abu-Zahra and  Parisa Khoshnoud and  Murtatha Jamel and  Subhashini Gunashekar,  Enhanced Thermal Properties of Rigid PVC Foams Using Fly Ash.   journal   = {International Journal of Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology.
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    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/10000155.