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- [3] REDDENING INDICATORS FOR QUASARS AND SEYFERT-1 GALAXIES ASTROPHYSICAL JOURNAL, 1983, 268 (02): : 591 - 601
- [5] THE ULTRAVIOLET VARIABILITY OF SEYFERT-1 GALAXIES ASTROPHYSICAL JOURNAL, 1985, 297 (01): : 151 - 165
- [6] INFRARED COLOR-SELECTED QUASARS AND SEYFERT-1 GALAXIES ASTROPHYSICAL JOURNAL, 1988, 327 (02): : L41 - L45
- [7] DISK STRUCTURE AND NUCLEAR ACTIVITY IN SEYFERT-1 GALAXIES ASTROPHYSICAL JOURNAL, 1980, 238 (01): : L1 - &