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Schaeidt, S. G.; Hasinger, G.; Trümper, J.: Time variability of extragalactic sources in the ecliptic pole regions. In: X-Ray Emission from Active Galactic Nuclei and the Cosmic X-Ray Background: Proceedings of a Conference held at the Max-Planck-Institut für extraterrestrische Physik, pp. 191 - 194 (Eds. Brinkmann, W.; Trümper, J.). X-Ray Emission from Active Galactic Nuclei and the Cosmic X-Ray Background, Garching, Germany, November 04, 1991 - November 08, 1991. Max-Planck-Institut für extraterrestrische Physik, Garching, Germany (1992)

Schartel, N.; Fink, H.; Brinkmann, W.; Trümper, J.: A comparative study of soft X-ray QSO spectra. In: X-Ray Emission from Active Galactic Nuclei and the Cosmic X-Ray Background: Proceedings of a Conference held at the Max-Planck-Institut für extraterrestrische Physik, pp. 195 - 197 (Eds. Brinkmann, W.; Trümper, J.). X-Ray Emission from Active Galactic Nuclei and the Cosmic X-Ray Background, Garching, Germany, November 04, 1991 - November 08, 1991. Max-Planck-Institut für extraterrestrische Physik, Garching, Germany (1992)

Thomas, H.-C.; Beuermann, K.; Brinkmann, W.; Fink, H. H.; Voges, W.: Spectroscopic identification of X-ray soft AGN found by ROSAT. In: X-Ray Emission from Active Galactic Nuclei and the Cosmic X-Ray Background: Proceedings of a Conference held at the Max-Planck-Institut für extraterrestrische Physik, pp. 383 - 386 (Eds. Brinkmann, W.; Trümper, J.). X-Ray Emission from Active Galactic Nuclei and the Cosmic X-Ray Background, Garching, Germany, November 04, 1991 - November 08, 1991. Max-Planck-Institut für extraterrestrische Physik, Garching, Germany (1992)

Treves, A.; Belloni, T.; Falomo, R.; Fink, H.; Maraschi, L.; Zimmermann, H. U.: Preliminary results on ROSAT observations of the blazar PKS 0537-441. In: X-Ray Emission from Active Galactic Nuclei and the Cosmic X-Ray Background: Proceedings of a Conference held at the Max-Planck-Institut für extraterrestrische Physik, pp. 206 - 209 (Eds. Brinkmann, W.; Trümper, J.). X-Ray Emission from Active Galactic Nuclei and the Cosmic X-Ray Background, Garching, Germany, November 04, 1991 - November 08, 1991. Max-Planck-Institut für extraterrestrische Physik, Garching, Germany (1992)

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