R. A. Salam and  M.A. Rodrigues,  Mining Image Features in an Automatic Two-Dimensional Shape Recognition System.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2008, vol. 13(1). 243 - 249
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/688.