Alam, S., Albareti, F. D., Allende Prieto, C., Anders, F., Anderson, S. F., Anderton, T., Andrews, B. H., Armengaud, E., Aubourg,
É., Bailey, S., Hekker, S., & et al. (2015). The Eleventh and Twelfth Data Releases
of the Sloan Digital Sky Survey: Final Data from SDSS-III. Astrophysical Journal, Suppl. Ser.,
219:. doi:10.1088/0067-0049/219/1/12.