WASET
    Zong Chen and  Li Zhang,  Multi-stage Directional Median Filter.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2009, vol. 35(11). 2094 - 2097
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/143.