Update README.md

README.md

@@ -14,7 +14,7 @@ This model is trained using [Pref-GRPO](https://codegoat24.github.io/UnifiedRewa
 
 
 For further details, please refer to the following resources:
-- 📰 Paper: 
+- 📰 Paper: https://arxiv.org/pdf/2508.20751
 - 🪐 Project Page: https://codegoat24.github.io/UnifiedReward/Pref-GRPO
 - 🤗 UniGenBench: https://github.com/CodeGoat24/UniGenBench
 - 🤗 Leaderboard: https://huggingface.co/spaces/CodeGoat24/UniGenBench_Leaderboard
@@ -51,5 +51,10 @@ image.save("flux-dev.png")
 ## Citation
 
 ```
-
+@article{Pref-GRPO&UniGenBench,
+  title={Pref-GRPO: Pairwise Preference Reward-based GRPO for Stable Text-to-Image Reinforcement Learning.},
+  author={Wang, Yibin and Li, Zhimin and Zang, Yuhang and Zhou, Yujie and Bu, Jiazi and Wang, Chunyu and Lu, Qinglin, and Jin, Cheng and Wang, Jiaqi},
+  journal={arXiv preprint arXiv:2508.20751},
+  year={2025}
+}
 ```