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WikiPedia: Thiên_hà_Bánh_Xe http://www.constellation-guide.com/cartwheel-galax... http://www.springerlink.com/content/v103526140211p... http://nedwww.ipac.caltech.edu/ http://sites.csn.edu/planetarium/galaxy.html http://burro.cwru.edu/SSAnims/CartwheelFull.mpg http://www.nasa.gov/mission_pages/galex/galex-2006... //doi.org/10.1007%2Fs10509-005-3423-5 https://ui.adsabs.harvard.edu/abs/1998A&A...330..8... https://ui.adsabs.harvard.edu/abs/2005Ap&SS.299..3...