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Wynn C.G.W.C.G.HoWynn C.G.W.C.G., Craig O.C.O.HeinkeCraig O.C.O., A neutron star with a carbon atmosphere in the Cassiopeia A supernova remnant, „Nature”, 462, 2009, s. 71–73, DOI: 10.1038/nature08525, arXiv:0911.0672 [astro-ph.HE](ang.).