R.Sukesh Kumar and  Abhisek Verma and  Jasprit Singh,  Color Image Segmentation and Multi-Level Thresholding by Maximization of Conditional Entropy.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2007, vol. 6(6). 1633 - 1641
    [viewed 08 December 2019]. Available from: https://publications.waset.org/pdf/4566.