link arXiv paper and update preferred citation

README.md

@@ -12,7 +12,7 @@ tags: [medical, x-ray, segmentation, anatomy]
 # FleXray data release
 
 - Website: [FleXray project page](https://flexray.csail.mit.edu/)
-- Paper: [FleXray: Universal Clinical X-ray Segmentation](https://github.com/VictorButoi/FleXray_paper)
+- Paper: [FleXray: Universal Clinical X-ray Segmentation](https://arxiv.org/abs/2609.26756)
 - Code: [github.com/VictorButoi/FleXray](https://github.com/VictorButoi/FleXray)
 
 Training and evaluation data for **FleXray**, a pan-anatomy X-ray segmentation model.
@@ -174,13 +174,14 @@ If you use either **FluXray** or our **MURA annotations**, please cite the
 FleXray paper:
 
 ```bibtex
-@software{butoi2026flexray,
-  title = {FleXray: Universal Clinical X-ray Segmentation},
-  author = {Butoi, Victor Ion and Gopalakrishnan, Vivek and
-            Guttag, John V. and Dalca, Adrian V. and Dey, Neel},
-  year = {2026},
-  license = {MIT},
-  url = {https://github.com/VictorButoi/FleXray}
+@misc{butoi2026flexray,
+      title={FleXray: Universal Clinical X-ray Segmentation},
+      author={Victor Ion Butoi and Vivek Gopalakrishnan and John V. Guttag and Adrian V. Dalca and Neel Dey},
+      year={2026},
+      eprint={2609.26756},
+      archivePrefix={arXiv},
+      primaryClass={cs.CV},
+      url={https://arxiv.org/abs/2609.26756},
 }
 ```