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BINGGELI, B.; SANDAGE, A.; TAMMANN, G. A. Studies of the Virgo Cluster. II - A catalog of 2096 galaxies in the Virgo Cluster area. S.1681–1759. Astronomical Journal [online]. Září 1985 [cit. 2018-05-29]. Roč. 90, s. 1681–1759. Dostupné online. doi:10.1086/113874. Bibcode1985AJ.....90.1681B. (anglicky)