Adding link to the paper
@@ -481,7 +481,8 @@ Example 9
+++++++++
Retrieve an image from skyview and overlay a Vizier catalog on it.
-This example approximately reproduces Figure 1 of 2016ApJ...826...16E,
+This example approximately reproduces Figure 1 of
+`2016ApJ...826...16E <http://adsabs.harvard.edu/abs/2016ApJ...826...16E>`_,
except with a different background.::
