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Xue, Y.-J.; Böhringer, H.; Matsushita, K.: An XMM-Newton study of the RGH 80 galaxy group. Astronomy & Astrophysics 420 (3), pp. 833 - 845 (2004)

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Hashimoto, Y.; Barcons, X.; Böhringer, H.; Fabian, A. C.; Hasinger, G.; Mainieri, V.; Brunner, H.: Abundance constraints and direct redshift measurement of the diffuse X-ray emission from a distant cluster of galaxies. Astronomy & Astrophysics 417 (3), pp. 819 - 825 (2004)

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Sato, Y.; Cowie, L. L.; Kawara, K.; Matsuhara, H.; Okuda, H.; Sanders, D. B.; Sofue, Y.; Taniguchi, Y.; Wakamatsu, K.-i.: Faint 6.7 micron galaxies and their contributions to the stellar mass density in the universe. The Astronomical Journal 127, pp. 1285 - 1304 (2004)