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Mateos, S.; Barcons, X.; Carrera, F. J.; Ceballos, M. T.; Hasinger, G.; Lehmann, I.; Streblyanska, A.; Fabian, A.: XMM-Newton observations of the lockman hole: spectra and time variability of the brightest AGN. In: Proceedings of the X-ray Universe 2005, pp. 801 - 806 (Ed. Wilson, A.). The X-ray Universe 2005, El Escorial, Madrid, Spain, September 26, 2005 - September 30, 2005. ESA Publications Division, Noordwijk, The Netherlands (2006)

Scholz, R.-D.; Lehmann, I.; Matute, I.; Zinnecker, H.: The coolest m-type subdwarf, the nearest cool white dwarf and other high proper motion discoveries. In: Proceedings of the 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, pp. 947 - 950 (Eds. Favata, F.; Battrick, B.). 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, Hamburg, Germany, July 05, 2004 - July 09, 2004. ESA Publications Division, Noordwijk, The Netherlands (2005)

Mainieri, V.; Rosati, P.; Nonino, M.; Szokoly, G.; Bergeron, J.; Hasinger, G.; Lehmann, I.; Tozzi, P.; CDFS Team, k.: Chandra Deep Field South: the optically faint population. X-Ray Surveys, in the Light of New Observatories, Santander, Spain, September 04, 2002 - September 06, 2002. Astronomische Nachrichten 324, pp. 20 - 23 (2003)