@misc{indiciaef83ea1ae8eee,
  title = {Emotion expression in human punishment behavior.},
  author = {Erte Xiao and Daniel Houser},
  year = {2005},
  doi = {10.1073/pnas.0502399102},
  url = {https://pubmed.ncbi.nlm.nih.gov/15878990/},
  note = {Source identifier: 15878990}
}