Jian-Wei Li and  Yao-Tien Wang and  Yi-Chun Chang,  A Learning-Community Recommendation Approach for Web-Based Cooperative Learning.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2013, vol. 77(5). 650 - 654
    [viewed 14 November 2019]. Available from: https://publications.waset.org/pdf/1475.