Irwin, Jimmy A.; Sarazin, Craig L. (Kasım 1996), "X-Ray Evidence for the Interaction of the Giant Elliptical Galaxy NGC 4472 with Its Virgo Cluster Environment", The Astrophysical Journal, 471 (2), s. 683, Bibcode:1996ApJ...471..683I, doi:10.1086/177998.
McNamara, Brian R.; Sancisi, Renzo; Henning, Patricia A.; Junor, William (Eylül 1994), "A violent interaction between the dwarf galaxy UGC 7636 and the giant elliptical galaxy NGC 4472", The Astronomical Journal, 108 (3), ss. 844-850, Bibcode:1994AJ....108..844M, doi:10.1086/117116.
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Irwin, Jimmy A.; Sarazin, Craig L. (Kasım 1996), "X-Ray Evidence for the Interaction of the Giant Elliptical Galaxy NGC 4472 with Its Virgo Cluster Environment", The Astrophysical Journal, 471 (2), s. 683, Bibcode:1996ApJ...471..683I, doi:10.1086/177998.
McNamara, Brian R.; Sancisi, Renzo; Henning, Patricia A.; Junor, William (Eylül 1994), "A violent interaction between the dwarf galaxy UGC 7636 and the giant elliptical galaxy NGC 4472", The Astronomical Journal, 108 (3), ss. 844-850, Bibcode:1994AJ....108..844M, doi:10.1086/117116.