@misc{indiciaee90334ce7b4e,
  title = {Cambrian Trilobites.},
  author = {C D Walcott},
  year = {1916},
  doi = {10.1073/pnas.2.2.101},
  url = {https://pubmed.ncbi.nlm.nih.gov/16576109/},
  note = {Source identifier: 16576109}
}