@article{article80e29d7b,
title   = {Metal-poor stars observed with the Magellan Telescope.: II. Discovery of four stars with [Fe/H] <= -3,5},
author = {Placco, Vinicius M and Frebel, Anna and Beers, Timothy C and Beers, Timothy C and Christlieb, Norbert and Lee, Young Sun and Kennedy, Catherine R and Rossi, Silvia Cristina Fernandes and Santucci, Rafael Miloni},
year = {2014},
doi = {10.1088/0004-637X/781/1/40},
journal   = {The Astrophysical Journal}
}