@misc{indiciae155a70c6e4bb,
  title = {An introduction to systematic studies.},
  author = {J C Pecknold and T A Ban and H E Lehmann and J A Stewart},
  year = {1976},
  url = {https://pubmed.ncbi.nlm.nih.gov/769028/},
  note = {Source identifier: 769028}
}