Follow-up observations of extremely metal-poor stars identified from SDSSD. S. Aguado, C. Allende Prieto, J. I. González Hernández, R. Carrera, R. Rebolo, M. Shetrone, D. L. Lambert and E. Fernández-AlvarA&A, 593 (2016) A10DOI: https://doi.org/10.1051/0004-6361/201628371
