White, Simon D. M. Cosmology, MPI for Astrophysics, Max Planck Society;
Abazajian, K., Adelman-McCarthy, J. K., Agüeros, M. A., Allam, S. S., Anderson, K. S. J., Anderson, S. F., et al. (2004). The Second Data Release of the Sloan Digital sky survey. The Astronomical Journal, 128(1), 502-512.