Viet-Hoang Vu and  Nhan Le-Thanh,  Concept Abduction in Description Logics with Cardinality Restrictions.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2010, vol. 47(11). 1779 - 1790
    [viewed 23 January 2020]. Available from: https://publications.waset.org/pdf/9228.