diff --git a/IPython/nbconvert/filters/citation.py b/IPython/nbconvert/filters/citation.py
index 2ee7e13..6874d42 100644
--- a/IPython/nbconvert/filters/citation.py
+++ b/IPython/nbconvert/filters/citation.py
@@ -44,8 +44,8 @@ def citation2latex(s):
     for citation in parser.citelist:
             outtext += s[startpos:citation[1]]
             outtext += '\\cite{%s}'%citation[0]
-            startpos = citation[2]
-    outtext += s[startpos:]
+            startpos = citation[2] if len(citation)==3 else -1
+    outtext += s[startpos:] if startpos <> -1 else ''
     return outtext
 
 #-----------------------------------------------------------------------------