@misc{indiciae38ab0283532e,
  title = {Trilobite protaspids showing superfamily differences},
  author = {A. R. Palmer},
  year = {1954},
  doi = {10.1126/science.119.3099.737.a},
  url = {https://pubs.usgs.gov/publication/70011050},
  note = {Source identifier: 70011050}
}