Update README.md

README.md

@@ -2,4 +2,16 @@
 tags:
 - hypergraph
 ---
-# email-Enron
+# email-Enron
+
+```
+@article{Benson-2018-simplicial,
+ author = {Benson, Austin R. and Abebe, Rediet and Schaub, Michael T. and Jadbabaie, Ali and Kleinberg, Jon},
+ title = {Simplicial closure and higher-order link prediction},
+ year = {2018},
+ doi = {10.1073/pnas.1800683115},
+ publisher = {National Academy of Sciences},
+ issn = {0027-8424},
+ journal = {Proceedings of the National Academy of Sciences}
+}
+```