Tetsuya Furukawa and  Masahiro Kuzunishi,  Multi-labeled Data Expressed by a Set of Labels.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    May 2010, vol. 41(5). 608 - 614
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/8262.