Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
Bartkevicius, A.; Lazauskaite, R. (December 1997), "Classification of Population II Stars in the Vilnius Photometric System. II. Results", Baltic Astronomy, 6 (4): 499–572, Bibcode:1997BaltA...6..499B, doi:10.1515/astro-1997-0402.
Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
Bartkevicius, A.; Lazauskaite, R. (December 1997), "Classification of Population II Stars in the Vilnius Photometric System. II. Results", Baltic Astronomy, 6 (4): 499–572, Bibcode:1997BaltA...6..499B, doi:10.1515/astro-1997-0402.