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Published in Astrofizika, Vol. 60, No. 2, pp. 317-321 (May 2017).
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Blauensteiner, M., Remmel, P., Riepe, P. et al. More Satellites Around the Nearby Spiral Galaxy NGC 7331. Astrophysics 60, 295–299 (2017). https://doi.org/10.1007/s10511-017-9482-9
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DOI: https://doi.org/10.1007/s10511-017-9482-9