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Bodensteiner, J.; Shenar, T.; Mahy, L.; Fabry, M.; Marchant, P.; Abdul-Masih, M.; Banyard, G.; Bowman, D. M.; Dsilva, K.; Frost, A. J.; Hawcroft, C.; Reggiani, M.; Sana, H. (2020). "Is HR 6819 a triple system containing a black hole?. An alternative explanation". Astronomy and Astrophysics. 641: 641. arXiv:2006.10770. Bibcode:2020A&A...641A..43B. doi:10.1051/0004-6361/202038682. S2CID219956076.
Frost, A. J.; Bodensteiner, J.; Rivinius, Th.; Baade, D.; Merand, A.; Selman, F.; Abdul-Masih, M.; Banyard, G.; Bordier, E.; Dsilva, K.; Hawcroft, C.; Mahy, L.; Reggiani, M.; Shenar, T.; Cabezas, M.; Hadrava, P.; Heida, M.; Klement, R.; Sana, H. (2022). "HR 6819 is a binary system with no black hole". Astronomy & Astrophysics. 659: L3. arXiv:2203.01359. Bibcode:2022A&A...659L...3F. doi:10.1051/0004-6361/202143004. S2CID247222660.
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Frost, A. J.; Bodensteiner, J.; Rivinius, Th.; Baade, D.; Merand, A.; Selman, F.; Abdul-Masih, M.; Banyard, G.; Bordier, E.; Dsilva, K.; Hawcroft, C.; Mahy, L.; Reggiani, M.; Shenar, T.; Cabezas, M.; Hadrava, P.; Heida, M.; Klement, R.; Sana, H. (2022). "HR 6819 is a binary system with no black hole". Astronomy & Astrophysics. 659: L3. arXiv:2203.01359. Bibcode:2022A&A...659L...3F. doi:10.1051/0004-6361/202143004. S2CID247222660.
Dachs, J.; Eichendorf, W.; Schleicher, H.; Schmidt-Kaler, T.; Stift, M.; Tug, H. (March 1981). "Photoelectric scanner measurements of Balmer emission line profiles for southern Be stars. II. A survey for variations". Astronomy & Astrophysics. 43: 427–453. Bibcode:1969ApJ...157..313H. doi:10.1086/190820.
Brown, A.G.A.; Verschueren, W. (1997). "High S/N Echelle spectroscopy in young stellar groups. II. Rotational velocities of early-type stars in SCO OB2". Astronomy and Astrophysics. 319: 811. arXiv:astro-ph/9608089. Bibcode:1997A&A...319..811B.
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Bodensteiner, J.; Shenar, T.; Mahy, L.; Fabry, M.; Marchant, P.; Abdul-Masih, M.; Banyard, G.; Bowman, D. M.; Dsilva, K.; Frost, A. J.; Hawcroft, C.; Reggiani, M.; Sana, H. (2020). "Is HR 6819 a triple system containing a black hole?. An alternative explanation". Astronomy and Astrophysics. 641: 641. arXiv:2006.10770. Bibcode:2020A&A...641A..43B. doi:10.1051/0004-6361/202038682. S2CID219956076.
Frost, A. J.; Bodensteiner, J.; Rivinius, Th.; Baade, D.; Merand, A.; Selman, F.; Abdul-Masih, M.; Banyard, G.; Bordier, E.; Dsilva, K.; Hawcroft, C.; Mahy, L.; Reggiani, M.; Shenar, T.; Cabezas, M.; Hadrava, P.; Heida, M.; Klement, R.; Sana, H. (2022). "HR 6819 is a binary system with no black hole". Astronomy & Astrophysics. 659: L3. arXiv:2203.01359. Bibcode:2022A&A...659L...3F. doi:10.1051/0004-6361/202143004. S2CID247222660.