WASET
    Mingook Lee and  Sungjoo Lee,  Identifying Business Opportunities Based on Patent and Trademark Portfolios: A Technology-Based Service Industry Case.   journal   = {International Journal of Industrial and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2015, vol. 102(6). 1940 - 1943
    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/10001761.