EXPLORING THE ORIGIN OF LITHIUM, CARBON, STRONTIUM, AND BARIUM WITH FOUR NEW ULTRA METAL-POOR STARS by Hansen, T., Hansen, C. J., Christlieb, N., Yong, D., Bessell, M. S., Beers, Timothy C., Placco, V. M., Norris, J. E., Asplund, M., Frebel, Anna L., Garcia Perez, A. E.

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