Web Information Systems Engineering - WISE 2019 20th International Conference, Hong Kong, China, January 19-22, 2020, Proceedings - Cheng, Reynold; Cheng, Reynold; Mamoulis, Nikos; Mamoulis, Nikos; Sun, Yizhou; Sun, Yizhou; Huang, Xin; Huang, Xin (Springer International Publishing : Imprint: Springer, 2019)