Teuku Rihayat and  Suryani,  Synthesis and Properties of Biobased Polyurethane/Montmorillonite Nanocomposites.   journal   = {International Journal of Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2010, vol. 41(5). 341 - 345
    [viewed 24 May 2022]. Available from: https://publications.waset.org/pdf/6239.