Add requested reference to AMICO.

Closes issue #7 .

references.bib

@@ -165,6 +165,19 @@ @ARTICLE{barth2007
    adsurl = {http://cdsads.u-strasbg.fr/abs/2007AJ....133.1085B},
   adsnote = {Provided by the SAO/NASA Astrophysics Data System}
 }
+@ARTICLE{bellagamba2017a,
+   author = {{Bellagamba}, F. and {Roncarelli}, M. and {Maturi}, M. and {Moscardini}, L.
+  },
+    title = "{AMICO: optimised detection of galaxy clusters in photometric surveys}",
+  journal = {ArXiv e-prints},
+archivePrefix = "arXiv",
+   eprint = {1705.03029},
+ keywords = {Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Astrophysics of Galaxies},
+     year = 2017,
+    month = may,
+   adsurl = {http://adsabs.harvard.edu/abs/2017arXiv170503029B},
+  adsnote = {Provided by the SAO/NASA Astrophysics Data System}
+}
 @ARTICLE{bowler2017a,
    author = {{Bowler}, R.~A.~A. and {Dunlop}, J.~S. and {McLure}, R.~J. and 
 	{McLeod}, D.~J.},

task_lists/clss/clss.tex

@@ -68,7 +68,9 @@ \subsection{Identifying and Characterizing Clusters}
 sequence method, will be hampered by the limited wavelength coverage
 of LSST. 
 For example, at $z \gtrsim 1.5$, near-IR photometry is required to 
-identify systems with Balmer/$4000$\AA\ breaks. 
+identify systems with Balmer/$4000$\AA\ breaks.
+Exploration of optimal filter methods could improve cluster identification
+\citep[e.g.,][]{bellagamba2017a}.
 To maximize cluster science with LSST, new techniques
 for cluster identification and the incorporate complementary data
 from projects such as \emph{Euclid} or \emph{eROSITA} must be devised.