updated reference style

README.md

@@ -157,17 +157,15 @@ python data_scripts/icsd_data_query.py --MPID <your_api_key>
 ```
 
 ## References
-If you use this code, please cite our [paper](https://arxiv.org/abs/2411.12011):
+If you use this code, please cite our [paper](https://arxiv.org/abs/2411.12011) [1]:
 
-```
-Amariamir, Sasan, Janine George, and Philipp Benner. "SynCoTrain: A Dual Classifier PU-learning Framework for Synthesizability Prediction." arXiv preprint arXiv:2411.12011 (2024).
-```
-
-```
+```bibtex
 @article{amariamir2024syncotrain,
   title={SynCoTrain: A Dual Classifier PU-learning Framework for Synthesizability Prediction},
   author={Amariamir, Sasan and George, Janine and Benner, Philipp},
   journal={arXiv preprint arXiv:2411.12011},
   year={2024}
 }
 ```
+
+[1] Amariamir, Sasan, Janine George, and Philipp Benner. "SynCoTrain: A Dual Classifier PU-learning Framework for Synthesizability Prediction." arXiv preprint arXiv:2411.12011 (2024).