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- [3] RADIO STRUCTURES OF SEYFERT-GALAXIES .3. RADIO AND OPTICAL OBSERVATIONS OF NGC-5548 ASTROPHYSICAL JOURNAL, 1982, 260 (01): : 56 - 64
- [5] Photometric Studies of the Seyfert Galaxies NGC 3516, NGC 5548, NGC 3227, NGC 4051, NGC 4151, and NGC 7469 Astrophysics, 2019, 62 : 163 - 176