Ashkan Izadi and Vic Ciesielski,  Evolved Strokes in Non Photo–Realistic Rendering.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2010, vol. 43(7). 1133 - 1138
    [viewed 28 January 2020]. Available from: https://publications.waset.org/pdf/3207.