@article{unknown2013on,
  title={On multilevel selection and kin selection: contextual analysis meets direct fitness},
  author={Charles Goodnight},
  journal={Evolution},
  volume={67},
  number={6},
  pages={1539-1548},
  journalpage={https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1558-5646.2012.01821.x},
  year={2013},
  citations={}
}