@article{theseventhdatareleaseofthesloandigital,
  title = {The Seventh Data Release of the Sloan Digital Sky Survey},
  author = {K. Abazajian},
  year = {2008},
  eprint = {0812.0649},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/0812.0649v2},
}