CD型星系
參考資料

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↑  Galaxy Clusters, Jan Hartlap, page 3
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↑  encyclopedia.com "supergiant elliptical" （页面存档备份，存于）
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↑  Nature, "FIGURE 4. Optical, radio and X-ray images of the Perseus cluster." （页面存档备份，存于） 9 July 2009, ISSN 0028-0836 ; EISSN 1476-4687 ; (accessed 15 April 2010)
↑  Nature, "FIGURE 3. The entropy of the intracluster medium in spherical shells of radius r." （页面存档备份，存于） 9 July 2009, ISSN 0028-0836 ; EISSN 1476-4687 ; (accessed 15 April 2010)
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↑  Lodi News-Sentinel, "Giant Galaxy Discovered", UPI, 26 October 1990, pg.9