...Picardi et al. (2004)

Our results were presented at the First Stars II meeting in May 2003; see http://www.astro.psu.edu/users/tabel/II/presentations/weiss.pdf.

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... paper

A summary of state-of-the-art-data and ideas can be found in the proceedings of Joint Discussion 4 (Astrophysical impact of abundances in globular cluster stars) of the IAU General Assembly XXV (Sydney 2003), D'Antona & da Costa (2004).

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... UMP stars

It appears that indeed several of them have ${\rm [O/Fe]} \approx 2$, similar to HE 0107-5240 (V. Hill, private communication).

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