@misc{hansen2007galaxy,
  title={The Galaxy Content of SDSS Clusters and Groups},
  author={Sarah M. Hansen and Erin S. Sheldon and Risa H. Wechsler and Benjamin P. Koester},
  year={2007},
  eprint={0710.3780},
  archivePrefix={arXiv},
  primaryClass={astro-ph},
  doi={10.1088/0004-637X/699/2/1333},
  url={https://arxiv.org/abs/0710.3780}
}