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P.M. McMahon, J.H. van Gorkom, O.-G. Richter et H.C. Ferguson, « H I imaging of NGC 3312 and NGC 3314a - A foreground group to the Hydra cluster? », Astronomical Journal, vol. 103, , p. 399-404, 680-682 (AJ Homepage), page 401 (DOI10.1086/116068, Bibcode1992AJ....103..399M, lire en ligne)
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P.M. McMahon, J.H. van Gorkom, O.-G. Richter et H.C. Ferguson, « H I imaging of NGC 3312 and NGC 3314a - A foreground group to the Hydra cluster? », Astronomical Journal, vol. 103, , p. 399-404, 680-682 (AJ Homepage), page 401 (DOI10.1086/116068, Bibcode1992AJ....103..399M, lire en ligne)
O.G. Richter, « The Hydra I cluster of galaxies. V.A catalogue of galaxies in the cluster area. », Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 77, , p. 237-256 (Bibcode1989A&AS...77..237R, lire en ligne)