Knowledge and Systems Sciences 20th International Symposium, KSS 2019, Da Nang, Vietnam, November 29 - December 1, 2019, Proceedings - Chen, Jian; Chen, Jian; Huynh, Van Nam; Huynh, Van Nam; Nguyen, Gia-Nhu; Nguyen, Gia-Nhu; Tang, Xijin; Tang, Xijin (Springer Singapore : Imprint: Springer, 2019)