Ruchti, G. R., Fulbright, J. P., Wyse, R. F. G., Gilmore, G. F., Bienaymé, O., Bland-Hawthorn, J., et al. (2011). Observational properties of the metal-poor thick disk of the Milky Way and insights into its origins. The Astrophysical Journal, 737(1): 9, pp. 1-24. doi:10.1088/0004-637X/737/1/9.