Update README.md

README.md

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 # Dataset Card for DRAGON
 
+[🧾 ArXiv Preprint](https://arxiv.org/abs/2505.11257)
+
 **DRAGON** is a large-scale Dataset of Realistic imAges Generated by diffusiON models.
 
 The dataset includes a total of **2.5 million training images** and **100,000 test images** generated using 25 diffusion models, spanning both recent advancements and older, well-established architectures.
@@ -70,7 +72,17 @@ To support a range of research needs, DRAGON includes predefined subsets of vary
 
 # Citation
 
-TBD
+```bibtex
+@misc{bertazzini2025dragon,
+  title={DRAGON: A Large-Scale Dataset of Realistic Images Generated by Diffusion Models}, 
+  author={Giulia Bertazzini and Daniele Baracchi and Dasara Shullani and Isao Echizen and Alessandro Piva},
+  year={2025},
+  eprint={2505.11257},
+  archivePrefix={arXiv},
+  primaryClass={cs.CV},
+  url={https://arxiv.org/abs/2505.11257}, 
+}
+```
 
 # Dataset Card Contact