add ICFEM paper

README.md

@@ -96,7 +96,7 @@ ADTree adds defence nodes on top of the attack trees used in [4].
 
 ![last Assignment](results/last/assignment/last_scheduling_1.png)
 
-### Toy Example
+### Example from [5]
 
 #### ADTree model
 
@@ -187,3 +187,7 @@ Rensink, and M. Stoelinga. Effective analysis of attack trees: A model-driven
 approach. In Fundamental Approaches to Software Engineering, pages 56–73.
 Springer, 2018.
 
+[5] J. Arias, C. E. Budde, W. Penczek, L. Petrucci, T. Sidoruk, and M.
+Stoelinga. Hackers vs. Security: Attack-Defence Trees as Asynchronous
+Multi-agent Systems. In Formal Methods and Software Engineering, vol. 12531,
+pages 3-19. Springer, 2020.