Update README.md

README.md

@@ -72,11 +72,12 @@ Please refer to the paper.
 
 
 **BibTeX:**
-
+```bibtex
 @inproceedings{xiao2023length,
   title={Length is a Curse and a Blessing for Document-level Semantics},
   author={Xiao, Chenghao and Li, Yizhi and Hudson, G and Lin, Chenghua and Al Moubayed, Noura},
   booktitle={Proceedings of the 2023 Conference on Empirical Methods in Natural Language Processing},
   pages={1385--1396},
   year={2023}
-}
+}
+```