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    E. Hajizadeh and  H. Garmabi,  Response Surface Based Optimization of Toughness of Hybrid Polyamide 6 Nanocomposites.   journal   = {International Journal of Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2007, vol. 10(10). 92 - 96
    [viewed 10 May 2024]. Available from: https://publications.waset.org/pdf/1966.