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Yoichi Takeda, Bun'ei Sato et Daisuke Murata, « Stellar parameters and elemental abundances of late-G giants », Publications of the Astronomical Society of Japan, vol. 60, no 4, , p. 781–802 (Bibcode2008PASJ...60..781T, arXiv0805.2434)
A. Mazumdar, A. Mérand, P. Demarque, P. Kervella, C. Barban, F. Baudin, V. Coudé du Foresto, C. Farrington et P. J. Goldfinger, « Asteroseismology and interferometry of the red giant star ɛ Ophiuchi », Astronomy and Astrophysics, vol. 503, no 2, , p. 521–531 (DOI10.1051/0004-6361/200912351, Bibcode2009A&A...503..521M, arXiv0906.3386)
Alessandro Massarotti, David W. Latham, Robert P. Stefanik et Jeffrey Fogel, « Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity », The Astronomical Journal, vol. 135, no 1, , p. 209–231 (DOI10.1088/0004-6256/135/1/209, Bibcode2008AJ....135..209M)
Shao-Lan Bi, Ling-Huai Li, Yan-Ke Tang et Ning Gai, « Asteroseismic study of the red giant in Ophiuchi », Research in Astronomy and Astrophysics, vol. 10, no 12, , p. 1265–1274 (DOI10.1088/1674-4527/10/12/007, Bibcode2010RAA....10.1265B)