GRETEL: Graph Contrastive Topic Enhanced Language Model for Long Document Extractive Summarization Qianqian Xie author Jimin Huang author Tulika Saha author Sophia Ananiadou author 2022-10 text Proceedings of the 29th International Conference on Computational Linguistics Nicoletta Calzolari editor Chu-Ren Huang editor Hansaem Kim editor James Pustejovsky editor Leo Wanner editor Key-Sun Choi editor Pum-Mo Ryu editor Hsin-Hsi Chen editor Lucia Donatelli editor Heng Ji editor Sadao Kurohashi editor Patrizia Paggio editor Nianwen Xue editor Seokhwan Kim editor Younggyun Hahm editor Zhong He editor Tony Kyungil Lee editor Enrico Santus editor Francis Bond editor Seung-Hoon Na editor International Committee on Computational Linguistics Gyeongju, Republic of Korea conference publication xie-etal-2022-gretel https://aclanthology.org/2022.coling-1.546/ 2022-10 6259 6269