↑C. Barbieri, G. De Marchi, A. Nota, G. Corrain, W. Hack, R. Ragazzoni et D. MacChetto, « First HST/FOC images of the low mass companion of the astrometric binary Gliese 623 », Astronomy and Astrophysics, vol. 315, no 1, , p. 418–420 (Bibcode1996A&A...315..418B)