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Diehl, Steven; Statler, Thomas S. (10 October 2007). "The Hot Interstellar Medium of Normal Elliptical Galaxies. I. A Chandra Gas Gallery and Comparison of X-Ray and Optical Morphology". The Astrophysical Journal. 668 (1): 150–167. arXiv:astro-ph/0606215. Bibcode:2007ApJ...668..150D. doi:10.1086/521009. S2CID14507041.