Sannikumar Patel and  Brian Nolan and  Markus Hofmann and  Philip Owende and  Kunjan Patel,  Sentiment Analysis: Comparative Analysis of Multilingual Sentiment and Opinion Classification Techniques.   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2017, vol. 126(6). 642 - 648
    [viewed 23 October 2019]. Available from: https://publications.waset.org/pdf/10007144.