@article{hammer2001,
  title={PAST: PALEONTOLOGICAL STATISTICAL SOFTWARE PACKAGE FOR EDUCATION AND DATA ANALYSIS},
  author={Øyvind Hammer and David A. T. Harper and Paul D. Ryan},
  year={2001},
  journal={Palaeontologia Electronica},
  url={https://knowledgetrend.com/paper/past-paleontological-statistical-software-package-for-education-and-data-analysis}
}