Nassier A. Nassir and  Robert Birch and  Zhongwei Guan,  Manufacturing Process of S-Glass Fiber Reinforced PEKK Prepregs.   journal   = {International Journal of Aerospace and Mechanical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2018, vol. 142(10). 943 - 947
    [viewed 29 May 2020]. Available from: https://publications.waset.org/pdf/10009600.