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- [46] NGC-7552 - A GALAXY WITH A DORMANT ACTIVE NUCLEUS ASTROPHYSICAL JOURNAL, 1994, 433 (01): : L13 - &
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- [49] ULTRAVIOLET AND OPTICAL VARIATIONS IN ACTIVE GALACTIC NUCLEI - THE SEYFERT-1 GALAXY NGC-5548 ASTROPHYSICAL JOURNAL, 1990, 354 (02): : 446 - 467
- [50] THE TWO-PHASE, TWO-VELOCITY IONIZED ABSORBER IN THE SEYFERT 1 GALAXY NGC 5548 ASTROPHYSICAL JOURNAL, 2010, 711 (02): : 888 - 906