WASET
    Ching-Shoei Chiang and  Sheng-Hsin Tsai and  James Chen,  The Control Vector Scheme for Design of Planar Primitive PH curves .   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2007, vol. 3(3). 547 - 553
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/4406.