Computing and Combinatorics 25th International Conference, COCOON 2019, Xi'an, China, July 29-31, 2019, Proceedings - Du, Ding-Zhu; Du, Ding-Zhu; Duan, Zhenhua; Duan, Zhenhua; Tian, Cong; Tian, Cong (Springer International Publishing : Imprint: Springer, 2019)