docs: point Paper badge at arXiv, add BibTeX and citation request

Author: Enderfga

README.md

@@ -22,7 +22,7 @@ Mike Zheng Shou<sup>3</sup> &nbsp; Li Jiang<sup>1,2</sup>
 
 <p>
   <a href="https://junchao-cs.github.io/SolarWM-Web/"><img alt="Project page" src="https://img.shields.io/badge/-Project%20Page-0A66C2?logo=googlechrome&amp;logoColor=white&amp;labelColor=555"></a>
-  <a href="https://junchao-cs.github.io/SolarWM-Web/assets/SolarWM-paper.pdf"><img alt="Paper" src="https://img.shields.io/badge/-Paper-B31B1B?logo=arxiv&amp;logoColor=white&amp;labelColor=555"></a>
+  <a href="https://arxiv.org/abs/2609.02886"><img alt="Paper" src="https://img.shields.io/badge/-Paper-B31B1B?logo=arxiv&amp;logoColor=white&amp;labelColor=555"></a>
   <a href="https://huggingface.co/datasets/junchaoh-cs/SolarWM-Data"><img alt="Hugging Face dataset" src="https://img.shields.io/badge/%F0%9F%A4%97-Dataset-yellow"></a>
   <a href="https://modelscope.cn/datasets/junchao2003/SolarWM-Data"><img alt="ModelScope dataset" src="https://img.shields.io/badge/-Dataset-624AFF?logo=modelscope&amp;logoColor=white&amp;labelColor=555"></a>
   <a href="https://docs.google.com/forms/d/e/1FAIpQLSfS-SLOiSRVDWwZ2kPl9ywN27aB6QplN0jpdKaBu-gG8aNsvQ/viewform"><img alt="Dataset Access Form" src="https://img.shields.io/badge/-Dataset%20Access%20Form-7248B9?logo=googleforms&amp;logoColor=white&amp;labelColor=555"></a>
@@ -237,7 +237,23 @@ thank the authors of all datasets and open-source projects listed in
 
 ## Citation
 
-The arXiv link and BibTeX entry are coming soon.
+**If you use SolarWM-Data, the data engine, or the released models in your research,
+please cite our paper.** The dataset is released for research use, and citation is how
+we can keep making it openly available.
+
+Paper: https://arxiv.org/abs/2609.02886
+
+```bibtex
+@misc{huang2026solarwmopendatascalable,
+      title={SolarWM: Open Data and Scalable Training for Long-Horizon Video World Models}, 
+      author={Junchao Huang and Guian Fang and Shengju Qian and Xianghao Kong and Zhuoran Zhao and Wei Huang and Yihua Du and Zixin Zhang and Justin Cui and Yuchao Gu and Yukang Chen and Xinting Hu and Tianyu He and Shaoshuai Shi and Zhuotao Tian and Xin Wang and Mike Zheng Shou and Li Jiang},
+      year={2026},
+      eprint={2609.02886},
+      archivePrefix={arXiv},
+      primaryClass={cs.CV},
+      url={https://arxiv.org/abs/2609.02886}, 
+}
+```
 
 ## License and attribution