Smriti H. Bhandari and  S. M. Deshpande,  Feature Extraction for Surface Classification – An Approach with Wavelets.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2007, vol. 5(5). 1351 - 1355
    [viewed 05 August 2020]. Available from: https://publications.waset.org/pdf/2826.