Add bibliography

Start a common bibliography file for SIGMathLing.

To create a pdf file with the \nocite{*} option: run make inside the bibliography directory.

Request for additions and changes in the issues page.

bibliography/SIGMathLing.bib

@@ -223,3 +223,13 @@ pages = {},
 title = {Domain Adaptation in Natural Language Processing}
 }
 
+@article{tshitoyan2019unsupervised,
+  title={Unsupervised word embeddings capture latent knowledge from materials science literature},
+  author={Tshitoyan, Vahe and Dagdelen, John and Weston, Leigh and Dunn, Alexander and Rong, Ziqin and Kononova, Olga and Persson, Kristin A and Ceder, Gerbrand and Jain, Anubhav},
+  journal={Nature},
+  volume={571},
+  number={7763},
+  pages={95},
+  year={2019},
+  publisher={Nature Publishing Group}
+}