Chinese Computational Linguistics : 20th China National Conference, CCL 2021, Hohhot, China, August 13-15, 2021, Proceedings - Li, Sheng; Che, Wanxiang; He, Shizhu; Kang, Liu; Liu, Yang; Rao, Gaoqi; Sun, Maosong; Wu, Hua (Springer International Publishing, 2021)