Update README.md

README.md

@@ -23,4 +23,14 @@ Members of CZLC do not own the copyright of the questions and answers included i
   year={2019},
   publisher={MIT Press One Rogers Street, Cambridge, MA 02142-1209, USA journals-info~…}
 }
-```
+@inproceedings{lee2019latent,
+  title={Latent Retrieval for Weakly Supervised Open Domain Question Answering},
+  author={Lee, Kenton and Chang, Ming-Wei and Toutanova, Kristina},
+  booktitle={Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics},
+  pages={6086--6096},
+  year={2019}
+}
+```
+
+## Contact
+Correspondence to: `[email protected]`.