Update README.md

README.md

@@ -261,4 +261,9 @@ We will have a paper out soon, but until then, please cite:
   year = {2023},
   url = {https://huggingface.co/datasets/stanfordnlp/SHP}
 }
-```
+```
+
+## References
+
+Ethayarajh, K., Choi, Y. &amp; Swayamdipta, S. (2022). Understanding Dataset Difficulty with $\mathcal{V}$-Usable Information. <i>Proceedings of the 39th International Conference on Machine Learning</i>, in <i>Proceedings of Machine Learning Research</i>. 162:5988-6008 Available from https://proceedings.mlr.press/v162/ethayarajh22a.html.
+