WASET
    Abbas Al-Refaie,  Cluster Analysis of Customer Churn in Telecom Industry.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2017, vol. 125(5). 1222 - 1226
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10007044.