The NIR Ca ii triplet at low metallicity - Searching for extremely low-metallicity stars in classical dwarf galaxies
E. Starkenburg, V. Hill, E. Tolstoy, J. I. González Hernández, M. Irwin, A. Helmi, G. Battaglia, P. Jablonka, M. Tafelmeyer, M. Shetrone, K. Venn and T. de Boer
