The HARPS search for southern extra-solar planets - XVIII. An Earth-mass planet in the GJ 581 planetary system
Michel Mayor, X. Bonfils, T. Forveille, X. Delfosse, Stephane Udry, Jean-Loup Bertaux, H. Beust, François Bouchy, C. Lovis, Francesco Pepe, C. Perrier, Didier Queloz, N.C. Santos
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