Vogt, Steven S.; Butler, R. Paul; Rivera, Eugenio J.; Haghighipour, Nader; Henry, Gregory W.; Williamson, Michael H. (September 29, 2010). "The Lick-Carnegie Exoplanet Survey: A 3.1 M_Earth Planet in the Habitable Zone of the Nearby M3V Star Gliese 581". The Astrophysical Journal. 723: 954–965. arXiv:1009.5733 [astro-ph.EP]. Bibcode:2010ApJ...723..954V. doi:10.1088/0004-637X/723/1/954.
Vogt, Steven S.; Butler, R. Paul; Rivera, Eugenio J.; Haghighipour, Nader; Henry, Gregory W.; Williamson, Michael H. (September 29, 2010). "The Lick-Carnegie Exoplanet Survey: A 3.1 M_Earth Planet in the Habitable Zone of the Nearby M3V Star Gliese 581". The Astrophysical Journal. 723: 954–965. arXiv:1009.5733 [astro-ph.EP]. Bibcode:2010ApJ...723..954V. doi:10.1088/0004-637X/723/1/954.
Vogt, Steven S.; Butler, R. Paul; Rivera, Eugenio J.; Haghighipour, Nader; Henry, Gregory W.; Williamson, Michael H. (September 29, 2010). "The Lick-Carnegie Exoplanet Survey: A 3.1 M_Earth Planet in the Habitable Zone of the Nearby M3V Star Gliese 581". The Astrophysical Journal. 723: 954–965. arXiv:1009.5733 [astro-ph.EP]. Bibcode:2010ApJ...723..954V. doi:10.1088/0004-637X/723/1/954.