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Instituto de Astronomia, Universidad Nacional Autonoma de Mexico. Published in English in Astrofizika, Vol. 20, No. 1, pp. 7–20, January–February, 1984, and republished here with minor editorial modifications.
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Pismis, P., Moreno, E. On the origin of tightly wound spiral features in galactic nuclei. Astrophysics 20, 1–10 (1984). https://doi.org/10.1007/BF01005894
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DOI: https://doi.org/10.1007/BF01005894