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WikiPedia: Abell_520 http://physicsworld.com/cws/article/news/30849 http://www.universetoday.com/2007/08/16/galaxy-clu... http://ned.ipac.caltech.edu/cgi-bin/nDistance?name... http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?... http://articles.adsabs.harvard.edu/cgi-bin/nph-iar... http://chandra.harvard.edu/photo/2007/a520/ http://www.cfht.hawaii.edu/en/news/DarkMatterCore/ //arxiv.org/abs/0809.3139 //arxiv.org/abs/astro-ph/9812394 //doi.org/10.1046%2Fj.1365-8711.1998.01949.x