Yuan L. Lai and  Jian H. Chen and  Jui P. Hung,  Development of Machinable Ellipses by NURBS Curves.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2008, vol. 14(2). 162 - 169
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/12852.