Timothee G. Leleu,  Recursive Similarity Hashing of Fractal Geometry.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2010, vol. 40(4). 384 - 391
    [viewed 27 January 2021]. Available from: https://publications.waset.org/pdf/14186.