WASET
    Semeh Ben Salem and  Sami Naouali and  Moetez Sallami,  A Computational Cost-Effective Clustering Algorithm in Multidimensional Space Using the Manhattan Metric: Application to the Global Terrorism Database.   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2017, vol. 126(6). 702 - 707
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10007220.