README citation update

README.md

@@ -1,4 +1,4 @@
-[![DOI](https://zenodo.org/badge/72916546.svg)](https://zenodo.org/badge/latestdoi/72916546)
+[![DOI](https://img.shields.io/badge/DOI-10.1021%2Facs.jcim.8b00512-blue.svg)](https://doi.org/10.1021/acs.jcim.8b00512)
 
 ![](images/ttclust_logo.png "logo" )
 
@@ -262,6 +262,11 @@ A plot of the distance matrix is also made and allows to easily visualize the di
 
 ![alt text](examples/backbone/backbone-distmat.png "Distance Matrix plot example")
 
+#CITATION
+If you use TTclust in a publication, please use this citation  
+
+Tubiana, T., Carvaillo, J.-C., Boulard, Y., & Bressanelli, S. (2018). TTClust: A Versatile Molecular Simulation Trajectory Clustering Program with Graphical Summaries. Journal of Chemical Information and Modeling, 58(11), 2178–2182. https://doi.org/10.1021/acs.jcim.8b00512
+
 
 ## Licence
 This program is under the GNU GPLv3 licence, which means that anyone who