WASET
    D. A. K. S. Gunaratna and  N. D. Kodikara and  H. L. Premaratne,  ANN Based Currency Recognition System using Compressed Gray Scale and Application for Sri Lankan Currency Notes - SLCRec.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2008, vol. 21(9). 2957 - 2962
    [viewed 09 May 2024]. Available from: https://publications.waset.org/pdf/13484.