Messier 87: Forskelle mellem versioner
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<ref name=localuniverse_1>{{cite web |url=https://www.strw.leidenuniv.nl/IAU-H/localuniverse.php |title=The Local Universe |website= International Astronomical Union Division H |publisher=University of Leiden |accessdate=1. maj 2018}}</ref>
<ref name=localuniverse_2>{{cite journal |author=Courtois, H. M. |author2=Pomarède, D. |author3=Tully, R. B. |author4=Hoffman, Y. |author5=Courtois, D. |display-authors=3 |date=
<ref name=localuniverse_3>{{cite web |url=http://www.astro.wisc.edu/our-science/research-areas/extragalactic-astronomy/local-universe/ |title=Local Universe |website=Department of Astronomy, University of Wisconsin-Madison |publisher=University of Wisconsin-Madison |accessdate=1. maj 2018}}</ref>
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