Damith Senanayake and  Lakmal Muthugama and  Laksheen Mendis and  Tiroshan Madushanka,  Customer Churn Prediction: A Cognitive Approach.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2015, vol. 99(3). 767 - 773
    [viewed 06 April 2020]. Available from: https://publications.waset.org/pdf/10000977.