Artie P. Hatzes: Radial Velocity Detection of Earth-mass Planets in the Presence of Activity Noise: The Case of Alpha Centauri Bb. In: Astrophysical Journal (zur Veröffentlichung angenommen). 21. Mai 2013, arxiv:1305.4960v1: „It may be premature to attribute the 3.24 day RV variations to an Earth-mass planet.“