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Durret, F. (1994-05-01). "Nuclear and extranuclear ionized gas in nine Seyfert 2 galaxies". Astronomy and Astrophysics Supplement Series. 105: 57–66. Bibcode:1994A&AS..105...57D. ISSN0365-0138.
Kotanyi, C. G.; Ekers, R. D. (1979-03-01). "Radio galaxies with dust lanes". Astronomy and Astrophysics. 73: L1 –L3. Bibcode:1979A&A....73L...1K. ISSN0004-6361.
Parma, P.; de Ruiter, H. R.; Fanti, C.; Fanti, R. (1986-04-01). "VLA observations of low luminosity radio galaxies. I – Sources with angular size smaller than two arcminutes". Astronomy and Astrophysics Supplement Series. 64: 135–171. Bibcode:1986A&AS...64..135P. ISSN0365-0138.