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Jancart, S.; Jorissen, A.; Babusiaux, C.; Pourbaix, D. (2005). “Astrometric orbits of SB9 stars”. Astronomy and Astrophysics442 (1): 365-380. doi:10.1051/0004-6361:20053003. ISSN0004-6361.
Campbell, W. W. (1900). “The variable velocity of beta Herculis in the line of sight.”. The Astrophysical Journal11: 140. doi:10.1086/140674. ISSN0004-637X.
Blazit, A.; Bonneau, D.; Koechlin, L.; Labeyrie, A. (1977). “The digital speckle interferometer : preliminary results on 59 stars and 3C 273.”. The Astrophysical Journal214: L79. doi:10.1086/182447. ISSN0004-637X.
