@misc{indiciae4a5c6639352d,
  title = {Type-concept, higher classification and evolution.},
  author = {L van der Hammen},
  year = {1981},
  doi = {10.1007/bf00116071},
  url = {https://pubmed.ncbi.nlm.nih.gov/6794261/},
  note = {Source identifier: 6794261}
}