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(en) Corinne Charbonnel, Jeffery A. Brown et George Wallerstein, « Mixing processes during the evolution of red giants with moderate metal deficiencies: the role of molecular-weight barriers », Astronomy & Astrophysics, vol. 332, , p. 204–214 (Bibcode1998A&A...332..204C, arXivastro-ph/9712207)