---
title: "Maosong Sun — papers of 2021 — 5 papers, the most cited first"
description: "Maosong Sun — papers of 2021: 5 papers on Elamur Research, the most cited first — what each work is about in our own words."
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# Maosong Sun — papers of 2021 — 5 papers, the most cited first

5 papers · [all years of Maosong Sun](https://md.research.elamur.ai/free/en/authors/maosong-sun/#years)

**[Lawformer: A Pre-trained Language Model for Chinese Legal Long Documents](https://md.research.elamur.ai/free/en/papers/xiao-2021-lawformer-pre-trained-language-model/) [AI Open](https://md.research.elamur.ai/free/en/venues/ai-open/)**Chaojun Xiao, Xueyu Hu, Zhiyuan Liu, et al.*2021 · 396 citations*

**[ONION: A Simple and Effective Defense Against Textual Backdoor Attacks](https://md.research.elamur.ai/free/en/papers/qi-2021-onion-simple-effective-defense-against/) [Conference on Empirical Methods in Natural Language Processing (EMNLP)](https://md.research.elamur.ai/free/en/venues/emnlp/)**Fanchao Qi, Yangyi Chen, Mukai Li, et al.*2021 · 280 citations*

**[Hidden Killer: Invisible Textual Backdoor Attacks with Syntactic Trigger](https://md.research.elamur.ai/free/en/papers/qi-2021-hidden-killer-invisible-textual-backdoor/) [Annual Meeting of the Association for Computational Linguistics (ACL)](https://md.research.elamur.ai/free/en/venues/acl/)**Fanchao Qi, Mukai Li, Yangyi Chen, et al.*2021 · 238 citations*

**[Mind the Style of Text! Adversarial and Backdoor Attacks Based on Text Style Transfer](https://md.research.elamur.ai/free/en/papers/qi-2021-mind-style-text-adversarial-backdoor/) [Conference on Empirical Methods in Natural Language Processing (EMNLP)](https://md.research.elamur.ai/free/en/venues/emnlp/)**Fanchao Qi, Yangyi Chen, Xurui Zhang, et al.*2021 · 189 citations*

**[ERICA: Improving Entity and Relation Understanding for Pre-trained Language Models via Contrastive Learning](https://md.research.elamur.ai/free/en/papers/qin-2021-erica-improving-entity-relation-understanding/) [Annual Meeting of the Association for Computational Linguistics (ACL)](https://md.research.elamur.ai/free/en/venues/acl/)**Yujia Qin, Yankai Lin, Ryuichi Takanobu, et al.*2021 · 139 citations*