RT Journal T1 A retrospective of knowledge graphs A1 Jihong YAN, Chengyu WANG, Wenliang CHENG, Ming GAO, Aoying ZHOU PB Front. Comput. Sci. FD 2018-01-12 YR 0 JF Frontiers of Computer Science JO Front. Comput. Sci. VO 0 IS 0 SP 55 DO 10.1007/s11704-016-5228-9 K1 knowledge graph;knowledge base;information extraction;logical reasoning;graph database LK {https://journal.hep.com.cn/fcs/EN/article/article_16138.shtml}