Kissling, W.M; Blow, G. L.; Allen, W. H.; Priestley, J.; Riley, P.; Daalder, P.; George, M. (1991). The Diameter of 9 Metis from the Occultation of SAO:190531. Proceedings of the Astronomical Society of Australia. 9 (1): 150—152. Bibcode:1991PASA....9..150K. doi:10.1017/S1323358000025352.
Kissling, W.M; Blow, G. L.; Allen, W. H.; Priestley, J.; Riley, P.; Daalder, P.; George, M. (1991). The Diameter of 9 Metis from the Occultation of SAO:190531. Proceedings of the Astronomical Society of Australia. 9 (1): 150—152. Bibcode:1991PASA....9..150K. doi:10.1017/S1323358000025352.
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Graham, A.; New Planet, Monthly Notices of the Royal Astronomical Society, Vol. 8, No. 6 (dated 14 April 1848!), p. 146 (signed 29 April 1848; the discovery was first announced on 27 April)
Graham, A.; Metis, Monthly Notices of the Royal Astronomical Society, Vol. 8, No. 7 (dated 12 May 1848), pp. 147—150