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WikiPedia: G299.2-2.9 https://arxiv.org/abs/0706.0524 https://ui.adsabs.harvard.edu/abs/2007ApJ...665.11... https://ui.adsabs.harvard.edu/abs/1996ApJ...465..8... https://doi.org/10.1086%2F520105 https://doi.org/10.1086%2F177467 https://www.worldcat.org/issn/0004-637X https://inspirehep.net/literature/752279 https://iopscience.iop.org/article/10.1086/520105/... https://chandra.harvard.edu/blog/node/314 https://chandra.harvard.edu/photo/2011/g299/