Changlong Sun, Yating Zhang, Qiong Zhang, Xiaozhong Liu. Legal Artificial Intelligence - Have You Lost a Piece from Jigsaw Puzzle?. In Andreas Martin, Knut Hinkelmann, Hans-Georg Fill, Aurona Gerber, Doug Lenat, Reinhard Stolle, Frank van Harmelen, editors, Proceedings of the AAAI 2020 Spring Symposium on Combining Machine Learning and Knowledge Engineering in Practice, AAAI-MAKE 2020, Palo Alto, CA, USA, March 23-25, 2020, Volume I. Volume 2600 of CEUR Workshop Proceedings, CEUR-WS.org, 2020. [doi]