Arp 147 (Finnish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Arp 147" in Finnish language version.

refsWebsite

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harvard.edu

chandra.harvard.edu

Arp 147: Giant Ring of Black Holes 9.2.2011. Harvard-Smithsonian Center for Astrophysics. Viitattu 29.9.2022. (englanniksi)

nasa.gov

apod.nasa.gov

Nemiroff, R.; Bonnell, J., eds.: The Double Ring Galaxies of Arp 147 from Hubble Astronomy Picture of the Day. 4.11.2008. NASA. Viitattu 29.9.2022. (englanniksi)