add BibTeX citation and link

README.md

 ## Supplemental information for "Data visualization heuristics for the physical sciences"
-Chad M. Parish* and Philip D. Edmondson <br>
+Chad M. Parish and Philip D. Edmondson <br>
 Fundamentals of Radiation Effect Group <br>
 Materials Science and Tecnhology Division <br>
 Oak Ridge National Laboratory <br>
@@ -8,9 +8,21 @@ Paper published in Materials and Design <br>
 # If you use any of these codes, please cite:<br>
 C.M. Parish and P. D. Edmondson, "Data visualization heuristics for the physical sciences," 
 Materials and Design, <b>V179</b> (2019) #107868<br>
+https://www.sciencedirect.com/science/article/pii/S0264127519303065 <br>
+Citation: <br>
+```
+@article{parish2019data,
+  title={Data visualization heuristics for the physical sciences},
+  author={Parish, Chad M and Edmondson, Philip D},
+  journal={Materials \& Design},
+  pages={107868},
+  year={2019},
+  publisher={Elsevier}
+}
+``` 
 <br>
-<br>
-`* parishcm@ornl.gov`<br>
+Contact: <br>
+`parishcm@ornl.gov` <br>
 <br>
 tested on Anaconda Python 3.6.8 and 3.7<br>
 Matplotlib 3.0.x<br>