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  1. Universitätssternwarte Göttingen, Göttingen, Deutschland

    K. J. Fricke

  2. Astronomische Institute der Universität Bonn, Bonn, Deutschland

    M. Reinhardt

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Fricke, K.J., Reinhardt, M. Aktive galaxien. Naturwissenschaften 62, 309–320 (1975). https://doi.org/10.1007/BF00608891

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