added link to usenix paper

README.md

@@ -1,11 +1,11 @@
 # The iCTF Framework
 
-This is the framework that the UC Santa Barbara Seclab uses to host the iCTF, and that can be used to create your own CTFs at http://ictf.cs.ucsb.edu/framework. The framework contains several components.
-
-The framework creates several VMs: one for the organizers and one for every team. The components that run on each are described below.
+This is the framework that the UC Santa Barbara Seclab uses to host the iCTF, and that can be used to create your own CTFs at http://ictf.cs.ucsb.edu/framework. The framework creates several VMs: one for the organizers and one for every team. The components that run on each are described below.
 
 We released this framework in the hope that it creates a focal point for hosting CTFs. Currently, attack-defense CTFs are the focus, but we are interested in other formats as well. Pull requests are always welcome!
 
+The CTF Framework contains several components, described below.
+
 ## Central Database
 
 This is the central database that tracks the game state. It runs on the Organizer VM and exposes a REST API.
@@ -21,3 +21,7 @@ This is the CTF dashboard, showing the scoreboard and allowing players to submit
 ## VM Creator
 
 This is the VM creater that is used by http://ictf.cs.ucsb.edu/framework to create organizer and team VMs.
+
+## Further Information
+
+The iCTF Framework is described in a paper presented at Usenix 3GSE 2014 (https://www.usenix.org/conference/3gse14/summit-program/presentation/vigna). That paper and presentation detail the history, philosophy, and design of the framework.