diff --git a/common/modules/swh-backmatter.org b/common/modules/swh-backmatter.org
index a293139..6f550cc 100644
--- a/common/modules/swh-backmatter.org
+++ b/common/modules/swh-backmatter.org
@@ -1,27 +1,33 @@
 #+COLUMNS: %40ITEM %10BEAMER_env(Env) %9BEAMER_envargs(Env Args) %10BEAMER_act(Act) %4BEAMER_col(Col) %10BEAMER_extra(Extra) %8BEAMER_opt(Opt)
 #+INCLUDE: "prelude.org" :minlevel 1
 
 # not to be included as a whole, just pick individual slides as you see fit
 
 * Conclusion
 ** Conclusion
   :PROPERTIES:
   :CUSTOM_ID: conclusion
   :END:
 *** Software Heritage is
     - a /reference archive/ of /all/ FOSS ever written
     - a unique /complement/ for /development platforms/
     - an international, open, nonprofit, /mutualized infrastructure/
     - at the service of our community, at the service of society
+*** References
+    #+BEAMER: \small
+    Roberto Di Cosmo, Stefano Zacchiroli.
+    /Software Heritage: Why and How to Preserve Software Source Code./
+    To appear, iPRES 2017, Kyoto, Sep 2017. Preprint:
+    #+BEAMER: \footnotesize
+    http://deb.li/swhipres17
 *** Come in, we're open!
     \url{www.softwareheritage.org} --- /sponsoring/, /job openings/ \\
     \url{wiki.softwareheritage.org} --- /internships/, /leads/ \\
     \url{forge.softwareheritage.org} --- /our own code/
-    #+BEAMER:  \vfill \flushright {\Huge Questions?} \vfill
 
 * FAQ
 ** Q: how about SHA1 collisions?
    :PROPERTIES:
    :CUSTOM_ID: faq-sha1
    :END:
    #+BEAMER: \lstinputlisting[language=SQL,basicstyle=\footnotesize]{../../common/source/swh-content.sql}