L. H. Chong and  Y. Y. Chen,  Text Summarization for Oil and Gas News Article.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2009, vol. 29(5). 1282 - 1285
    [viewed 13 April 2021]. Available from: https://publications.waset.org/pdf/4926.