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References
- 1 2 "Announcing: The International X-ray Observatory (IXO)". NASA. 24 July 2008. Retrieved 13 March 2021.
This article incorporates text from this source, which is in the public domain. - ↑ "The Constellation X-Ray Mission" (PDF). 21 July 2011. Archived from the original (PDF) on 21 July 2011. Retrieved 13 March 2021.This article incorporates text from this source, which is in the public domain.
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