Seth Redfield, Michael Endl, William D. Cochran and Lars Koesterke «Sodium Absorption from the Exoplanetary Atmosphere of HD 189733b Detected in the Optical Transmission Spectrum». The Astrophysical Journal Letters, 673, 673, 20-01-2008, pàg. L87–L90. arXiv: 0712.0761. Bibcode: 2008ApJ...673L..87R. DOI: 10.1086/527475.
Seth Redfield, Michael Endl, William D. Cochran and Lars Koesterke «Sodium Absorption from the Exoplanetary Atmosphere of HD 189733b Detected in the Optical Transmission Spectrum». The Astrophysical Journal Letters, 673, 673, 20-01-2008, pàg. L87–L90. arXiv: 0712.0761. Bibcode: 2008ApJ...673L..87R. DOI: 10.1086/527475.
Seth Redfield, Michael Endl, William D. Cochran and Lars Koesterke «Sodium Absorption from the Exoplanetary Atmosphere of HD 189733b Detected in the Optical Transmission Spectrum». The Astrophysical Journal Letters, 673, 673, 20-01-2008, pàg. L87–L90. arXiv: 0712.0761. Bibcode: 2008ApJ...673L..87R. DOI: 10.1086/527475.