1801H. arXiv:astro-ph/9801214 . doi:10.1086/300322. The authors give a metallicity of: [ F e H ] = − 0.3 {\displaystyle {\begin{smallmatrix}\left[{\frac
The kinematics of globular clusters, apocentric distances and a halo metallicity gradient. Astronomy and Astrophysics. 1996, 313: 119–128. Bibcode:1996A&A