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(en) Charpinet, S, Fontaine, G, Brassard, P, Green, EM, Van Grootel, V, Randall, SK, Silvotti, R, Baran, AS, Østensen, RH, Kawaler, SD et al., « A compact system of small planets around a former red-giant star », Nature, Nature Publishing Group, vol. 480, no 7378, , p. 496-499 (DOI10.1038/nature10631, lire en ligne).