Update README.md

README.md

@@ -79,10 +79,10 @@ print(outputs)
 ## Citation
 
 ```latex
-@misc{liu2025understanding,
-  title={Understanding R1-Zero-Like Training: A Critical Perspective},
-  author={Zichen Liu and Changyu Chen and Wenjun Li and Penghui Qi and Tianyu Pang and Chao Du and Wee Sun Lee and Min Lin},
-  year={2025},
-  howpublished={\url{https://github.com/sail-sg/understand-r1-zero}},
+@article{liu2025understanding,
+  title={Understanding r1-zero-like training: A critical perspective},
+  author={Liu, Zichen and Chen, Changyu and Li, Wenjun and Qi, Penghui and Pang, Tianyu and Du, Chao and Lee, Wee Sun and Lin, Min},
+  journal={arXiv preprint arXiv:2503.20783},
+  year={2025}
 }
 ```