docs: Update website documentation

Change-Id: I01fa76eabc327a5638627b27bc51e6330d5ad210
Refs: #4213, #4039
diff --git a/docs/source/intro.rst b/docs/source/intro.rst
index 20fc56f..9dd0908 100644
--- a/docs/source/intro.rst
+++ b/docs/source/intro.rst
@@ -21,7 +21,7 @@
 - Allows [simulation of real applications](http://ndnsim.net/2.1/guide-to-simulate-real-apps.html)
   written against ndn-cxx library
 
-                
+
 A new release of `NS-3 based Named Data Networking (NDN) simulator <http://ndnsim.net/1.0/>`__
 went through a number of extensive refactoring and rewriting.  The key new features of the
 new version:
@@ -62,7 +62,9 @@
 More documentation
 ------------------
 
-Overall structure of ndnSIM is described in our technical reports:
+Overall structure of ndnSIM is described in our paper and technical reports:
+
+- **S. Mastorakis, A. Afanasyev, and L. Zhang, "On the Evolution of ndnSIM: an Open-Source Simulator for NDN Experimentation," ACM SIGCOMM Computer Communication Review (CCR), July 2017** (`PDF <https://ccronline.sigcomm.org/wp-content/uploads/2017/08/sigcomm-ccr-final112-full-letter.pdf>`__, `BibTex <http://web.cs.ucla.edu/~mastorakis/bibtex-ndnsim>`__)
 
 - **S. Mastorakis, A. Afanasyev, I. Moiseenko, and L. Zhang, "ndnSIM 2: An updated NDN simulator for NS-3," NDN, Technical Report NDN-0028, Revision 2, 2016** (`PDF <https://named-data.net/wp-content/uploads/2016/11/ndn-0028-2-ndnsim-v2.pdf>`__, `BibTex <http://lasr.cs.ucla.edu/afanasyev/bibwiki/bibtex/399>`__)