Update README.md

README.md

@@ -75,6 +75,12 @@ We evaluate UltraLong-8B on a diverse set of benchmarks, including long-context
 Chejian Xu ([email protected]), Wei Ping ([email protected])
 
 ## Citation
+@article{ulralong2025,
+  title={From 128K to 4M: Efficient Training of Ultra-Long Context Large Language Models},
+  author={Xu, Chejian and Ping, Wei and Xu, Peng and Liu, Zihan and Wang, Boxin and Shoeybi, Mohammad and Catanzaro, Bryan},
+  journal={arXiv preprint},
+  year={2025}
+ }
 
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