J. Prakash and K. Rajesh, A Novel Approach for Coin Identification using Eigenvalues of Covariance Matrix, Hough Transform and Raster Scan Algorithms. journal = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2008, vol. 20(8). 2596 - 2602 [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/4579.