WASET
    Semeh Ben Salem and  Sami Naouali and  Moetez Sallami,  Clustering Categorical Data Using the K-Means Algorithm and the Attribute’s Relative Frequency.   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2017, vol. 126(6). 708 - 713
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10007221.