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- [1] THE ORIGIN OF THE CONTINUUM OF AGN AND THE X-RAY-BACKGROUND PROCEEDINGS OF THE 23RD ESLAB SYMPOSIUM ON TWO TOPICS IN X-RAY ASTRONOMY, VOLS 1 AND 2: X-RAY BINARIES; AGN AND THE X-RAY BACKGROUND, 1989, 296 : 1097 - 1104
- [2] X-RAY SELECTED QUASARS AND SEYFERT-GALAXIES - COSMOLOGICAL EVOLUTION, LUMINOSITY FUNCTION, AND CONTRIBUTION TO THE X-RAY-BACKGROUND ASTROPHYSICAL JOURNAL, 1984, 283 (02): : 486 - 494
- [4] THE X-RAY-BACKGROUND AND THE EVOLUTION OF QUASARS ASTROPHYSICAL JOURNAL, 1986, 308 (01): : 53 - 58
- [7] THE CONTRIBUTION OF YOUNG GALAXIES TO THE X-RAY-BACKGROUND ASTROPHYSICAL JOURNAL, 1980, 237 (03): : 647 - 654
- [8] CONTRIBUTIONS OF LOW-LUMINOSITY SOURCES TO THE X-RAY-BACKGROUND ASTROPHYSICAL JOURNAL, 1989, 344 (01): : 125 - 134
- [9] VERY LOW LUMINOSITY ACTIVE GALAXIES AND THE X-RAY-BACKGROUND ASTROPHYSICAL JOURNAL, 1984, 283 (02): : 479 - 485