Update README.md

README.md

@@ -187,4 +187,4 @@ If you use our iterative transformer model for your scientific publication or yo
 
 ### References
 
-><div id="graves-2016">Alex Graves. 2016. Adaptive computation time for recurrent neural networks. CoRR, abs/1603.08983.</div>
+><div id="graves-2016">Alex Graves. 2016. <a href="https://arxiv.org/abs/1603.08983" target="_blank">Adaptive computation time for recurrent neural networks.</a> CoRR, abs/1603.08983.</div>