Zamanov, R. K. et al. (October 2008), “Rotational velocities of the giants in symbiotic stars - III. Evidence of fast rotation in S-type symbiotics”, Monthly Notices of the Royal Astronomical Society390 (1): 377-382, arXiv:0807.3817, Bibcode: 2008MNRAS.390..377Z, doi:10.1111/j.1365-2966.2008.13751.x.
Zamanov, R. K. et al. (October 2008), “Rotational velocities of the giants in symbiotic stars - III. Evidence of fast rotation in S-type symbiotics”, Monthly Notices of the Royal Astronomical Society390 (1): 377-382, arXiv:0807.3817, Bibcode: 2008MNRAS.390..377Z, doi:10.1111/j.1365-2966.2008.13751.x.
Keenan, Philip C.; McNeil, Raymond C. (1989), “The Perkins catalog of revised MK types for the cooler stars”, Astrophysical Journal Supplement Series71: 245, Bibcode: 1989ApJS...71..245K, doi:10.1086/191373.
Zamanov, R. K. et al. (October 2008), “Rotational velocities of the giants in symbiotic stars - III. Evidence of fast rotation in S-type symbiotics”, Monthly Notices of the Royal Astronomical Society390 (1): 377-382, arXiv:0807.3817, Bibcode: 2008MNRAS.390..377Z, doi:10.1111/j.1365-2966.2008.13751.x.
Keenan, Philip C.; McNeil, Raymond C. (1989), “The Perkins catalog of revised MK types for the cooler stars”, Astrophysical Journal Supplement Series71: 245, Bibcode: 1989ApJS...71..245K, doi:10.1086/191373.