add paper info

README.md

@@ -594,13 +594,21 @@ Datasets from BeyondArena, a unified, holistic benchmark for tabular data that s
 across sample size and feature dimensionality scales, with diverse feature types (with text, with high cardinality) from a
 broad range of disciplines.
 
-We introduce BeyondArena and its datasets in: [PLACEHOLDER]
+We introduce BeyondArena and its datasets in **[Beyond IID: How General Are Tabular Foundation Models, Really?](https://arxiv.org/abs/2606.30410)**.
 
 <details>
 <summary><b>Click for BibTeX!</b></summary>
 
-```text
-PLACEHOLDER
+```bibtex
+@misc{purucker2026iidgeneraltabularfoundation,
+      title={Beyond IID: How General Are Tabular Foundation Models, Really?}, 
+      author={Lennart Purucker and Andrej Tschalzev and Nick Erickson and Gioia Blayer and David Holzmüller and Alan Arazi and Alexander Pfefferle and Mustafa Tajjar and Gaël Varoquaux and Frank Hutter},
+      year={2026},
+      eprint={2606.30410},
+      archivePrefix={arXiv},
+      primaryClass={cs.LG},
+      url={https://arxiv.org/abs/2606.30410}, 
+}
 ```
 </details>
 
@@ -935,12 +943,24 @@ Individual datasets retain their original licenses; see each dataset metadata fo
 
 If you use BeyondArena, please cite:
 
-**PLACEHOLDER**
+**Beyond IID: How General Are Tabular Foundation Models, Really?**
+Lennart Purucker, Andrej Tschalzev, Nick Erickson, Gioia Blayer, David Holzmüller, Alan Arazi, Alexander Pfefferle, Mustafa Tajjar, Gaël Varoquaux, Frank Hutter
+*arXiv:2606.30410*
+
+📄 [arXiv](https://arxiv.org/abs/2606.30410)
 
 **BibTeX:**
 
 ```bibtex
-PLACEHOLDER
+@misc{purucker2026iidgeneraltabularfoundation,
+      title={Beyond IID: How General Are Tabular Foundation Models, Really?}, 
+      author={Lennart Purucker and Andrej Tschalzev and Nick Erickson and Gioia Blayer and David Holzmüller and Alan Arazi and Alexander Pfefferle and Mustafa Tajjar and Gaël Varoquaux and Frank Hutter},
+      year={2026},
+      eprint={2606.30410},
+      archivePrefix={arXiv},
+      primaryClass={cs.LG},
+      url={https://arxiv.org/abs/2606.30410}, 
+}
 ```