Extra-mixing extremely metal-poor red giants - Spite, M; Cayrel, R; Hill, V; Spite, F; Francois, P; Plez, B; Bonifacio, P; Molaro, P; Depagne, E; Andersen, J; Barbuy, Beatriz Leonor Silveira; Beers, T. C; et al. (IAU Symposium, 2006)