Kallima: A Clean-Label Framework for Textual Backdoor Attacks - Xiaoyi Chen; Yinpeng Dong; Zeyu Sun; Shengfang Zhai; Qingni Shen; Wu, Zhonghai (Computer Security - ESORICS 2022 - 27th European Symposium on Research in Computer Security, Copenhagen, Denmark, September 26-30, 2022, Proceedings, Part I, 2022)