Update README.md

README.md

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 # Welcome to the xGen-small family!
 
-[xGen-small](https://www.salesforce.com/blog/xgen-small-enterprise-ready-small-language-models/) is an enterprise-ready compact LM that combines domain-focused data curation, scalable pre-training, length-extension, and RL fine-tuning to deliver long-context performance at predictable, low cost.
-**This model release is for research purposes only.**  
+**xGen-small** ([blog](https://www.salesforce.com/blog/xgen-small-enterprise-ready-small-language-models/), [arXiv](https://arxiv.org/abs/2505.06496)) is an enterprise-ready compact LM that combines domain-focused data curation, scalable pre-training, length-extension, and RL fine-tuning to deliver long-context performance at predictable, low cost.
+**This model release is for research purposes only.**
 
 <p align="center">
 <img width="60%" src="https://huggingface.co/Salesforce/xgen-small/resolve/main/xgen-small.png?download=true">