Sumith Matharage and  Damminda Alahakoon,  Growing Self Organising Map Based Exploratory Analysis of Text Data.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2014, vol. 88(4). 639 - 646
    [viewed 27 September 2020]. Available from: https://publications.waset.org/pdf/9998179.