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Abella Danger Abell 520 Abella de la Conca Abell 426 Abel Luciatti Abelia Abel Tasman Abel Korzeniowski Abelia chinensis Abelia parvifoliaTài liệu tham khảo
WikiPedia: Abell 520 http://physicsworld.com/cws/article/news/30849 http://www.universetoday.com/2007/08/16/galaxy-clu... http://adsabs.harvard.edu/abs/2008A&A...491..379G http://adsabs.harvard.edu/abs/2012ApJ...747...96J http://adsabs.harvard.edu/abs/2012ApJ...758..128C http://adsabs.harvard.edu/abs/2014ApJ...783...78J http://adsabs.harvard.edu/abs/2017ApJ...847...23P http://chandra.harvard.edu/photo/2007/a520/ http://www.cfht.hawaii.edu/en/news/DarkMatterCore/ //arxiv.org/abs/0809.3139