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2. Ambarzumian, V. A. 1971, in Nuclei of Galaxies ed. D. J. K. O'Connell, Pontificia Acad. Sci. (Vatican: North Holland), 9
3. Ambarzumian, V. A. 1975, Proc. 3d, European Astronomical Meeting, (Tbilisi), ed. E. K. Kharadze (Abastumani: Acad.Sci. Georgia SSR), 91
4. Peculiar Galaxies and Radio Sources
5. Lines of Galaxies from Radio Sources