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- [6] AN EXTRAORDINARY EMISSION-LINE NEBULOSITY ASSOCIATED WITH THE SEYFERT-GALAXY MARKARIAN-335 ASTROPHYSICAL JOURNAL, 1981, 247 (01): : 32 - 41
- [7] VARIABILITY OF EMISSION-LINE SPECTRUM OF NUCLEUS OF SEYFERT-GALAXY NGC7469 ASTRONOMICHESKII ZHURNAL, 1975, 52 (03): : 481 - 490
- [8] ON THE EMISSION-LINE RESPONSE TO CONTINUUM VARIATIONS IN THE SEYFERT-GALAXY NGC-5548 ASTROPHYSICAL JOURNAL, 1990, 365 (01): : L5 - L7
- [10] THE DISCOVERY OF AN O-VII EMISSION-LINE IN THE ASCA SPECTRUM OF THE SEYFERT-GALAXY NGC-3783 ASTROPHYSICAL JOURNAL, 1995, 438 (02): : L67 - L70