P. Sengottuvelan and  T. Gopalakrishnan,  Efficient Web Usage Mining Based on K-Medoids Clustering Technique.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2015, vol. 100(4). 1037 - 1041
    [viewed 01 March 2021]. Available from: https://publications.waset.org/pdf/10003216.