Added *.bib file

README.md

@@ -95,3 +95,8 @@ GTSAM is open source under the BSD license, see the [`LICENSE`](LICENSE) and [`L
 Please see the [`examples/`](examples) directory and the [`USAGE`](USAGE.md) file for examples on how to use GTSAM.
 
 GTSAM was developed in the lab of [Frank Dellaert](http://www.cc.gatech.edu/~dellaert) at the [Georgia Institute of Technology](http://www.gatech.edu), with the help of many contributors over the years, see [THANKS](THANKS.md).
+
+## GTSAM Citation
+
+Use the following to cite GTSAM:
+

references.bib

@@ -0,0 +1,9 @@
+@misc{gtsam,
+    author       = {Borg Lab},
+    title        = {{GTSAM}},
+    month        = jul,
+    year         = 2020,
+    doi          = {},
+    version      = {4.0.3},
+    url          = {}
+    }