Ahn, Christopher P. et al. (2012-11-19). “The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey”. The Astrophysical Journal Supplement Series (American Astronomical Society) 203 (2): 21. arXiv:1207.7137. Bibcode: 2012ApJS..203...21A. doi:10.1088/0067-0049/203/2/21. ISSN0067-0049.
Ahn, Christopher P. et al. (2012-11-19). “The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey”. The Astrophysical Journal Supplement Series (American Astronomical Society) 203 (2): 21. arXiv:1207.7137. Bibcode: 2012ApJS..203...21A. doi:10.1088/0067-0049/203/2/21. ISSN0067-0049.
Ahn, Christopher P. et al. (2012-11-19). “The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey”. The Astrophysical Journal Supplement Series (American Astronomical Society) 203 (2): 21. arXiv:1207.7137. Bibcode: 2012ApJS..203...21A. doi:10.1088/0067-0049/203/2/21. ISSN0067-0049.
Ahn, Christopher P. et al. (2012-11-19). “The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey”. The Astrophysical Journal Supplement Series (American Astronomical Society) 203 (2): 21. arXiv:1207.7137. Bibcode: 2012ApJS..203...21A. doi:10.1088/0067-0049/203/2/21. ISSN0067-0049.